I am considering a short trip to Leeds, using it as a base to visit both the Saltaire WHS and the Studley Park WHS. Are there any UK tentative sites within reach from there?

Hmm.. not really, the nearest would be Cresswell Crags which is just south of Sheffield.

I had never heard of it before it turned up on the tentative list if that is any indication its renown. I would also be exceptionally surprised if it even made it off the bottom of list of UK tentative sites, seems a really odd one to me, it is not exactly Altamira or the Lower Awash Valley.

Jodrell Bank observatory is also in the region, to me it seems more interesting

If you have your own transport the Lake District could well be viable.

From Leeds I would say the most interesting non WHS related places are York (could have been a WHS if they were in the mood for it in the 80's) and Harrogate (en-route to Studley the Turkish baths are a nice treat). Otherwise Haworth (for Bronte sister associations) and Hebden Bridge are also nice.

I don't know much about Manchester (aiming for a first visit soon) but that may also appeal for it's museums and cultural life.

Food wise Bradford is well know for its curries, and if you are in Yorkshire on a Sunday it would be rude not have the eponymous pudding with a roast.

Manchester is also well known for its industrial heritage. It was on the former T-list, didn´t manage to get into the current one but is surely going to reemerge some time and justly so.

Manchester also has an element of the "Birthplace of the Railways" serial site which last time made it to the tentative, tentative list.

Thanks all, I'll let you know where I've been...