This particular one is frost tender, as I expect you know - you could try cutting the stems down to the base to see if it regrows, but they may well have bitten the dust.

Thanks for the reply flag. I'm loath to give up on them so I'll take my chances with cutting down the stems and hope they come back.

I have 2 here, Shane, the some of the leaves went 'mushy' but others didn't.
I left the plants alone and the stems have produced new growth, also new stems coming from the base too.

Thanks Louise. All my leaves are mushy but some stems still seem viable. I will wait and see if I get new growth.