I, for my part, wasn't doubting the integrity of the vendor, more the durability of the new name. I've been doing my homework and found the diary of the cactus hunting trip and, specifically, the entry for the collection in question http://www.copiapoa.info/copiapoathon/20030609.htm . Based on the c...

It's kind of difficult because it was said on a mailing list. You can interrogate the database of old posts via this page: http://www.labs.agilent.com/bot/cactus_home . Strangely, the Huntington website hasn't been updated to say this: http://www.huntington.org/BotanicalDiv/ISI2006/catalogorder.html

Ralph Martin's field number database http://ralph.cs.cf.ac.uk/Cacti/fieldno.html confirms it is C. humilis. Cactus & Co website doesn't have any details of No2 journal for this year, yet.

Definitely a Crassula, cooperi seems about right to me.

The cristate form (now Austrocylindropuntia vestita)

It made me smile when I saw the pot front left, with a large cuckoo amongst those dainty cobweb types.

Be aware that that mixed planting on the left contains plants that grow at very different rates - the Opuntia on the left will quickly swamp the small ones at the front. Long term it's worth splitting them up but nice to enjoy in the meantime.

It's not very fair on the pondlife if they get all their water taken away in summer or, worse, poured onto a cactus!

Hmmm, not sure. The normal O. monacantha's as tough as old boots, so in theory this should be too, but can't be 100% certain. Won't be as tender as B. brasiliensis though.

13 looks like Parodia (formerly Notocactus) mammulosa.
No 11 could be the Rebutia it claims to be. It looks like Brian Fearn's handwriting (Abbey Brook) but I can't quite make it out!