I am down in Liverpool for a couple of days and staying in the Marriott Hotel at Speke. It is the old 1930's Art Deco airport building and they have done a pretty good job in restoring it, both inside and out. The airport building and two hangers are Grade II listed. One of the hangers is a David Lloyd Health club and they seem to be working on the other at the moment.
The hotel itself seems to be pretty much intact, including control tower. They have a load of old transport posters in the lobby (BOAC etc.). There is also a fantastic viewing terrace on the roof, which you are not supposed to access (Health and Safety - apparently they are not allowed to alter the railings because of the listing) but I obviously ignored the 'maintenance only' signs and went up for a look. You get a great view over the Mersey estuary, North Wales hills and the planes landing and taking off at the new airport.
Would definitely recommend it for anyone coming down this way.
See http://www.marriott.co.uk/LPLMS