Martin Platt Martin Platt is the father of David Platt and second husband of Gail Tilsley . Student Martin started working at Jim ' s Cafe in January 1985 , where he worked alongside Gail , who was then married to Brian Tilsley . After Brian ' s death in 1989 , Martin and Gail began a relationship despite a ten - year age difference ( Martin being the younger of the two ) . When Gail fell pregnant , she decided to have an abortion , as she didn ' t want Martin to feel she was trapping him , but Martin stopped her and she gave birth to their son David in December 1990 . Martin and Gail married in September the following year , and he adopted her older children Nicky and Sarah Louise the following month . Martin and Gail had a happy marriage and the age difference wasn ' t often an issue . Martin spent four years at college studying nursing and it was there that he had a one - night stand with Cathy Power in 1994 , but he and Gail got through this . In 2000 , he had an affair with nurse Rebecca Hopkins and the heartbreak of Rebecca leaving him made Martin tell Gail the truth and divorce her . However , they remained good friends and Martin was still there for Gail and the children . Martin later started a relationship with sixteen - year - old Katy Harris , much to the ire of her father Tommy who never accepted the relationship and kept trying to split them up . Tommy finally got his way when he got Katy to abort Martin ' s unborn baby , under the mistaken impression that Martin was having an affair . Martin split up with Katy and in the tragic circumstances which followed , Katy killed Tommy in a fit of rage and then took her own life . Martin found greater happiness later in the year when he left Weatherfield for Liverpool with his new girlfriend Robyn and in 2006 Robyn gave birth to their daughter . Martin has not returned to Weatherfield since his departure but David occasionally visits him in Liverpool . Biography . Martin Platt arrived as a school leaver who worked in Jim ' s Cafe . He had two GCEs and was studying at Salford Technical college . Jenny Bradley developed a crush on Martin and the two began hanging out , though Martin was more interested in friendship rather than romance . Just after Christmas 1986 , Martin accompanied Jenny to a talent contest where she won first prize . As Martin was driving her home , Jenny persuaded Martin to let her have a go at driving the car . Unfortunately Jenny crashed the car and the accident left Martin unconscious in Weatherfield General . When Martin came to , Jenny asked him to take the blame for the crash and Martin agreed . However , when Jenny ' s father Alan Bradley confronted him about the accident Jenny broke down and told the truth . Jenny remained interested in Martin romantically for quite some time , although her crush finally ended when the two went grape - picking in France and Jenny fell in love with a Frenchman Patrice Podevin . However Martin and Jenny remained close friends . In 1988 , Martin had a short - lived romance with Sally Webster ' s younger sister Gina Seddon . Soon afterwards , Martin became caught up in the drama between Alan and his partner Rita Fairclough when he began working for Alan and discovered that Alan was cheating on Rita . Martin covered for Alan but Jenny also suspected her father of having an affair and after talking to Martin she realised that her suspicions were true . The following year , Martin and Jenny interrupted Alan during his attempt to murder Rita and Martin chased after Alan as Alan escaped in his car . Relationship with Gail Tilsley . Martin began comforting Gail after her husband Brian was stabbed in 1989 . To everyone ' s surprise , they fell in love with each other . Gail fell pregnant and didn ' t think it was fair for someone young like Martin to become a dad , so planned to have the baby aborted . However , Martin found out and managed to stop her . On Christmas Day 1990 , they had a baby boy and named him David . They got married in 1991 and Martin adopted Gail ' s two children Nick and Sarah , from her previous marriage to Brian . Affair with Rebecca Hopkins . In 1999 , Martin had an affair with nurse Rebecca Hopkins . Martin was all set to leave Gail for Rebecca but his plans changed when it was discovered that Sarah was pregnant at the age of just thirteen . Rebecca eventually left Weatherfield and Martin and Gail couldn ' t patch up their relationship , so later divorced . Gail went on to marry Richard Hillman , who turned out to be a serial killer who murdered Maxine Peacock , his ex - wife Patricia and then attempted to kill Gail and the children . However Martin saved them along with Kevin Webster and Tommy Harris . Even though they were divorced , Gail and Martin still remained good friends afterwards and Martin would normally come round for tea with Gail and the children and Sarah ' s daughter Bethany . Relationship with Katy Harris . In 2003 , Martin fell in love with sixteen - year - old Katy Harris . Katy ' s father , Tommy , who had previously been Martin ' s friend , disapproved , and attacked Martin physically , whilst Katy ' s brother , Craig , attempted to kill Martin by interfering with the brakes on his car . Katy ' s parents were even more unhappy when she left school and got pregnant . Sally Webster ( one of Martin ' s ex - girlfriends ) was having an affair with work colleague Ian Davenport , and her friendship with Martin , who was working particularly late hours , made Tommy and Angela Harris believe they were having an affair . They told Katy , who moved out of Martin ' s flat and had an abortion . When Gail told them the truth , Katy was devastated . She confronted Tommy in a rage , and attacked him with a wrench , killing him . Because of the bad blood between Martin and Tommy , Martin was at first arrested for the murder . Even though Angela only witnessed the murder of Tommy , she confessed to doing it . Martin was released , and Angela arrested . Katy was hysterical , and as a diabetic , decided to commit suicide by forgoing her insulin injections and eating sugar . Martin , Sarah and Sarah ' s then boyfriend Scooter Makuna managed to get Katy to hospital , but she later died . Leaving for Liverpool . Martin left Coronation Street with new girlfriend Robyn in November 2005 . David was devastated by this and didn ' t talk to Martin for some time , but they reconciled before he left . In January 2006 , David returned after visiting Martin and revealed that Martin and his girlfriend were expecting a baby . Martin was supposed to return for Sarah ' s wedding to Jason Grimshaw in 2007 to give her away , however couldn ' t make it as his daughter was ill . David went to visit Martin in 2009 as he had enough of his mother Gail and her boyfriend Joe McIntyre and returned a couple of weeks later . He was not in attendance at David ' s wedding to Kylie Turner in April 2011 . By May 2015 , Martin still had contact with his family . In July 2015 , David went to stay with Martin in order to take a break from problems at home , involving stepson Max ' s behavioural problems and also conflicts with Max ' s father Callum Logan . When he returned , he told Gail that Martin had bought a new house with a big garden and a posh kitchen and had received a promotion at work . Although Martin sent his love on to Gail , David pointedly told her that his dad had done really well in life since he had split from her . After the killer of his wife Clayton Hibbs was sent down for her murder , David along with his step - son Max and daughter Lily went to see Martin in November 2016 . Background information . Martin ' s 2005 departure came due Sean Wilson being axed when he refused to take part in a storyline involving Martin having a relationship with an underage girl . Sean opposed due to having a family of his own . He gave up acting and started a career in cheese making , although he has stated he may like to return to " Coronation Street " . But in 2013 , Sean Wilson vowed not to return to the street , as mentioned in his book " The Great Northern Cook book " . He is quoted " " By 2005 I knew my tenure on the Street had to end . An editorial decision was made that Martin should embark on an underage relationship , something that made me uncomfortable . I picked up my coat and left in September in that year ending 21 years of massive fun with a fabulous on - set family . " " He then goes onto saying " “ I will act again , but never with " Coronation Street " . They were very rude to me when I left , I would rather walk down any other street even if I had a nail in my shoe . ” " Quotes . " Uh , yeah . " ( First line ) " See you later mate " ( Final line to his son , David )