I am sorry to say that they probably froze. Pitcher plant may be OK (many are quite hardy) but those translucent cacti are most likely gone. Wet soil didn't help either.

Do you know how cold it got inside of your GH?

Those cacti are basically dead, sorry. You might try taking cuttings off the greener bits on one or two - but probably best to bin them and replace.

Rina it got to about -8 degrees centigrade outside for a day the rest of the time is was about -4 for a week, so i'm guessing maybe it was 0 or -1

Paul, how would i take a cutting of the cacti?

Thank you for the detailed response by the way, I'm really annoyed at myself as 'patient 2' is my oldest i raised from a tiny thing only a couple of centimetres tall, all the rest i've brought only got a year ago so i'm not distraught over them.

Would it be worth keeping them all inside for a week or 2 to see if they improve, or shall i just take some cuttings and bin the mother plants now?

Harry

Parts that are frozen will most likely turn to mush faster if kept warmer; they may just rot and/or mold over if kept cold and since he soil is wet. You could check them now by gently squeezing (not easy with all those spines - maybe use newspaper 'collar'). But I think they are finished/dead in either case.

I would take cuttings of alive parts and try to root them. Cut off the healthy looking parts using sharp blade. Check the flesh to make sure it isn't oozing liquid and/or is not too soft. If yes, cut off bit more. Let it callus for few days; if healthy enough, day or two may be enough-bit longer is probably better. After callusing, pot them into dry mix and do not water for a while. Hopefully there is enough live tissue to start roots growing.

I am little surprised by such damage if temps were just touch below 0*C, but wet soil was probably culprit here.

Hello Harry from Shropshire, Gill from Staffordshire here!

No consolation to you but my plants also got trashed in my g/h due to the Beast from the East. I did a post myself about it all. Went down to -9 for several days here, even my tell tale thermometer outside seemed to freeze up solid so goodness knows what was going on out there!

My place is very exposed, the g/h takes the full blast of the wind, plants turned to mush. I’ve cut back as much as I could of the limp and damaged growths to get back to firm growth and there was over a bucket full of gloop, mainly off my many types of jades. However, on checking them again yesterday I have further surgery to do as they're receding back further and most are bendy and waterlogged again, so the damage had gone further than I had hoped. I fear over half my collection is doomed :-(

All very annoying indeed. Luckily my c/s collection is small compared to others on here, around 30 odd succs.... jades, stapelias and Thanksgiving cacti, plus one pokey cactus. Other g/h inhabitants are 2 dozen overwintering geraniums which looked a bit sad but should pull through, 12 assorted potted palm trees which should be good to go and pots of dormant agapanthus.

Fingers crossed you will be able to save some of your plants.

Gill