Question: In what year did the Handsworth Grammar School located just off the A41 begin admitting girls in addition to boys?

Context articles: Handsworth Grammar School
Chatham Grammar School for Boys
Jason John (athlete)
A41 road
Wilmington Grammar School for Boys
Handsworth Wood Girls' Academy
Caulfield Grammar School
Dave Martin (screenwriter)
Pate's Grammar School
King Edward VI High School, Stafford

Handsworth Grammar School is a voluntary aided grammar school that admits boys from the age of eleven and eighteen (as well as girls in the sixth form, since September 1997).
 The school was founded in 1862 and is located in Handsworth, Birmingham, England.
 it is situated just off the A41, near the junction with the A4040.
 Handsworth Grammar School is sometimes abbreviated as HGS.
Holcombe Grammar School (formally Chatham Grammar School for Boys) is a grammar school with academy status in Chatham, Kent, England.
 It is a selective school.
 From the 2017-18 academic year, the school planned to become co-educational and remain selective in the lower school.
 This was blocked - and later approved - by the Department for Education with co-educational admission desired for the 2018/19 school year.
 The school has changed name in advance of becoming co-educational and plans to change all references from "Chatham Grammar School for Boys" to "Holcombe Grammar School" over academic year 2016/17.
Jason John (born 17 October 1971) is a retired English athlete who competed in the sprinting events.
 He represented Great Britain at the 1992 Barcelona Olympics and won a silver medal in the 4 x 100 metres relay at the 1993 World Championships (he ran in the heats and semis but not the final).
 He also won a silver medal at the 1996 European Indoor Championships and reached the final at the 1993 World Indoor Championships.
 In addition, he represented his country at two World Championships, in 1993 and 1995.
 Born in Birmingham, he attended Handsworth Grammar School, and went on to become an English teacher.
The A41 is a major trunk road in England that links London and Birkenhead, although it has now in parts been superseded by motorways.
 It passes through or near various towns and cities including Watford, Kings Langley, Hemel Hempstead, Aylesbury, Solihull, Birmingham, West Bromwich, Wolverhampton, Newport, Whitchurch, Chester and Ellesmere Port.
Wilmington Grammar School for Boys (WGSB) is a grammar school with academy status in Wilmington, Kent.
 The school, which from 1954 to 1982 was called Dartford Technical High School, is a specialist Engineering school with a strong emphasis on Design Technology, Mathematics and Physics.
 The uniform consists of blue blazers, white shirts, grey trousers and different ties for each house within the school.
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 Suits are worn in the sixth form.
 The school is situated directly alongside Wilmington Academy and has a bus service that also serves Dartford Grammar School for Girls, Dartford Grammar School, Wilmington Grammar School for Girls and Wilmington Academy.
Handsworth Wood Girls' Academy (formerly Handsworth Wood Girls School) is a secondary school and sixth form with academy status located in Handsworth Wood, Birmingham.
 The building that Handsworth Wood Girls' Academy currently occupies used to be known as Handsworth Wood Boys' School but it went through a change over ten years ago.
 The headteacher is Mrs Nicola Walters.
 The school achieved an academy status in November 2012.
Caulfield Grammar School is an independent, co-educational, Anglican, day and boarding school, located in Melbourne, Victoria, Australia.
 Founded in 1881 as a boys' school, Caulfield began admitting girls exactly one hundred years later.
 The school amalgamated with Malvern Memorial Grammar School (MMGS) in 1961, with the MMGS campus becoming Malvern Campus.
David Ralph Martin (1 January 1935 – 30 March 2007) was an accomplished television and film writer.
 He was born in Handsworth, Birmingham, England and attended Handsworth Grammar School.
Pate's Grammar School is a grammar school academy status located in the Hesters Way area Cheltenham, Gloucestershire, England.
 It caters for pupils aged 11 to 18 and is a Beacon school.
 The school was founded with a fund bestowed to Corpus Christi College, Oxford by Richard Pate in 1574.
 The school became co-educational in 1986, when Pate's Grammar School for Girls merged with Cheltenham Grammar School.
 In fact, the first female pupils came to the (Boys) Grammar School in 1971/72 to take their A-levels in the 6th form, and vice versa.
King Edward VI High School, is a Mixed secondary school located in the Highfields area of Stafford, England.
 The school has a sixth form, which forms part of the Stafford Collegiate.
 It is a comprehensive state school admitting boys and girls from ages 11-18.
 The school was formed in 1977 following the amalgamation of King Edward VI Boys’ Grammar School and Stafford Girls’ High School.