Forgive me for being a little over critical here but Bravo HGT's by virtue of rarity will be classics soon and looking at that one the reason they end up so rare is obvious.
Poor thing.
Sadly to buy that car, find original wheels, replace the windows as that film stuff never comes off properly, remove all evidence of drug use from the interior (new seats, new carpet, new door cards, new headlining, new parcel shelf, new dash, new seatbelts, gear nob, steering wheel, all new plastic trim and soundproofing), rebuild the engine and gearbox makes it a £3,000+ car to consider.
If you want to buy, use it; and can live with the wheels and being stopped by the Police every time you go past an ANPR camera then offer £500 or walk.
If you want to buy the car, strip out the ganja essence interior, put on a decent set of wheels and go rallying that would be a more fitting end.