Extremely difficult to find anything Prog at all, but some tenuous near-prog-related (kind of)
I live half-way between Winchester and Alton - so the obvious choice would be Winchester Town by Saturnalia.
Sadly, Alton isn't very Prog but it was once home to Alison Goldfrapp so Felt Mountain is an option and the original Fanny Adams was imfamously murdered there in the 19th century so (non-prog, but good never-the-less) Sweet Fanny Adams by The Sweet.
The Watercress Steam Railway runs past my house - Locomotive Breath (Tull)
The real Blackwater Park is about 12 miles north of here - (but Opeth are nowhere to be seen)
I once lived in the Bedfordshire village of Harrold, so Harold the Barrel (Genesis) or Harold Land (Yes)
I was born in Southend-on-Sea so Holidaymaker by Kaleidoscope (and anything by Danielle Dax) ... and lived in the adjoining town of Shoeburyness (mentioned in Billericay Dickie by Ian Dury and The Blockheads)