Question: Carnaby Street is a radio programme whose broadcast covers a firth that comprises part of what?

Context paragraphs:
Carnaby Street (radio programme): Carnaby Street, also referred to as Carnaby Street International (CSI), is a radio programme broadcast on Manx Radio on Saturday mornings and features music from the 1960s.  It is presented by Chris Williams and generally comprises music and news from two chosen years.  The programme is produced by Blackpool Bullet Productions for Chris Williams Entertainments and is sponsored by the Isle of Man Railways.  The show is broadcast throughout the Isle of Man on FM and MW frequencies.  In addition the transmission covers North West England, North Wales, Southwest Scotland and Northeastern parts of Ireland on 1368 kHz AM (219 metres medium wave).  It is also broadcast worldwide through the Manx Radio website.

Marlborough Street Magistrates Court: Marlborough Street Magistrates Court was a court of law at 19–21 Great Marlborough Street, Soho London, between the early 19th and late 20th centuries.  The court saw many significant trials, including those of Oscar Wilde, Christine Keeler, Keith Richards and John Lennon.  The court closed in 1998 and is now The Courthouse Hotel London, a 5-star hotel next to London Palladium Theatre, and opposite Carnaby Street and Liberty London.

Carnaby Street: Carnaby Street is a pedestrianised shopping street in Soho in the City of Westminster, Central London.  Close to Oxford Street and Regent Street, it is home to fashion and lifestyle retailers, including a large number of independent fashion boutiques.

Solway Firth: The Solway Firth (Scottish Gaelic: "Tràchd Romhra" ) is a firth that forms part of the border between England and Scotland, between Cumbria (including the Solway Plain) and Dumfries and Galloway.  It stretches from St Bees Head, just south of Whitehaven in Cumbria, to the Mull of Galloway, on the western end of Dumfries and Galloway.  The Isle of Man is also very near to the firth.  The firth comprises part of the Irish Sea.

Ganton Street: Ganton Street is a street in central London that runs between Marshall Street and Kingly Street.  It is crossed by Carnaby Street, and Newburgh Street joins it on its north side.  The street is in a part-pedestrianised area dominated by independent clothing shops and restaurants, and on upper floors, offices, particularly media companies.  Immediately to the east of Regent Street, Ganton Street is variously described as being in the West End, Soho and "Carnaby" areas.

Tweet of the Day: Tweet of the Day is a British radio programme broadcast on BBC Radio 4 on weekdays at 05.58am from Monday to Friday.  It is also broadcast on Sundays, when it is broadcast at a later time of day.  The first episode was broadcast on 6 May 2013 and featured the song of the male common cuckoo presented by David Attenborough.  The series won the Broadcasting Press Guild's award for radio programme of the year in 2014.  The series was scheduled for one year, and by the end of the year 266 different bird sounds were featured.  The series is being repeated.

Take the Floor (Scottish radio programme): Take the Floor is the name of a radio programme airing on BBC Radio Scotland.  It is the longest-running radio programme in Scotland, dating back to the 1930s when it was called Scottish Dance Music and broadcast by the Scottish Home Service.  The programme was given its present name of Take the Floor in 1978 by Chris Worrall, a Music Producer with BBC Radio Scotland (1978-82), who introduced 'live sessions' and 'programme road shows' touring Scotland, together with player interviews, an events diary and reviews of latest record/CD releases.  The original programme was presented by David Findlay until his death in 1981 and then by Robbie Shepherd until he stepped down in 2016.  In keeping with its predecessor, the current programme also features live sessions from top dance bands, individual musicians and vocalists from across the country.  The host of the programme is Gary Innes.  The programme airs on Saturday evenings and is repeated on Sunday afternoons.  Its theme music is traditional Scottish reel "Kate Dalrymple".

Londinium (Batman TV series): The three-part Londinium episode during "Batman"'s third and final season ("The Londinium Larcenies", "The Foggiest Notion", and "The Bloody Tower") was the series' tribute to the Swinging London period of the 1960s.  At the time of the show, everything British was "hot" in North America.  Many aspects of London were parodied during the three episodes.  The city's name is changed to Londinium, which was the name of an important trading and administrative centre of Roman Britannia, which was slightly smaller than the City of London where the modern British capital is now situated.  Scotland Yard becomes "Ireland Yard" in the series.  Carnaby Street becomes "Barnaby Street".  Fleet Street, the city's press district, is changed to "Bleet Street".  The prime minister is called the first minister.  There is a jokey reference to The Beatles when Bruce Wayne refers to a drum-playing Dick Grayson as "Ringo."

Swinging London: Swinging London was a youth-driven cultural revolution that took place in London during the mid-to-late 1960s emphasizing modernity and fun-loving hedonism.  It saw a flourishing in art, music and fashion, and was symbolized by the city's "pop and fashion exports," like the British Invasion, Mary Quant's miniskirt, popular fashion models such as Twiggy and Jean Shrimpton, the mod subculture, the iconic status of popular shopping areas (such as King's Road, Kensington and Carnaby Street), the political activism of the anti-nuclear movement; and sexual liberation.  Music was a big part of the scene, with "the London sound" including the Who, the Kinks, the Small Faces and the Rolling Stones; bands which were the mainstay of pirate radio stations like Radio Caroline and Swinging Radio England.  The Swinging London also reached British cinema, which "saw a surge in formal experimentation, freedom of expression, colour, and comedy."  During this period, "creative types of all kinds gravitated to the capital, from artists and writers to magazine publishers, photographers, advertisers, film-makers and product designers."

Great Marlborough Street: Great Marlborough Street is a thoroughfare in Soho, Central London.  It runs east of Regent Street past Carnaby Street towards Noel Street.

Supporting paragraphs: Carnaby Street (radio programme) Solway Firth
Answer: the Irish Sea