If you need to add in Wapping/Cumberland to make it a full evening, then you've not explored the place properly! There's far more to it than first meets the eye - and some quite good archeaology if you know what to look for.
Sorry I seem to have overlooked my familiarity, and de- valued the Dev'. but have more interest in geology than archeology. (and the Dev' was 'stripped' to be a show cave in Victorian times, and seems more 'sterile' than a lot of Masson.)
That said , as a purely personal opinion. It has a very large un-supported ceiling! a few good crawls, and a little of the secondary mineralization (not withstanding that which is in the Geological museum, or Natural History / Mineralogy hall) Or that which became plumbing, or anything related to the 'spar, or other industries that pre-dated good old cave rape / heavy footfall & numpties. (mud fighting cave leaders!)
It (The Dev') Is well worth a look, I seriously didn't think back to the first few/ or more times I ventured in.
Do a few photo's and enjoy / post your trip!
Humbly yours, Owd Git.