Thanks @Reds !!Hi Hoffy
We will be getting our annex and both the annex wallls and the fridge will apparently have a warning sign attached regarding when using the fridge on gas you cannot put up the end walls. As other people have said put the responsibility on the user. Which I am most happy with. If use the fridge on gas I wouldn't be putting up the walls anyway as it would only be a short stay.
Regards
Red
I'm going to contact the annex suppliers and see if this can be done. I don't understand why some annex suppliers are happy to do this, yet others are not??
Thanks for your info, much appreciated.