The BBC Micro version was developed by Roger Taylor and James Byrne; the earliest use of their 'Ashminster Computing' code.
In 2013/14 John McManus produced an official app version of the game for Apple iPad/iPhone.
Unofficial Spanish versions exist.
I've just converted Hampstead to the Z-machine using unQuill. Now I'm going to play it. Hurray! My first Quill game!
Enjoy! It's pretty unfair at times and some of the puzzles are downright obscure - but on the whole, it's a lot of fun and none too difficult :)
Original and fun, but requires an advanced level of specific UK cultural knowledge - some puzzles are based on it. As a satire, it works very well. As an adventure, it is a bit of an acquired taste and probably not for everyone.
This was a big game for me back in the 1980s. I worked at it for weeks and eventually solved it. It is very much of its time and place, but has a sharp satirical edge that raises it about most of what was written in the era. I have just made an updated version in Inform 7 as part of an bootcamp learning the language!