To be honest I've been a little dissapointed the last few times I've used the Club Kitchen. Seems mainly to be mini chocalate bars (twix), pre-wrapped c heese/biscuits, crisps, a little fruit and help yourself drinks (nice if you want a few glasses of OJ). There are the odd microwave options but they never look too appetizing.
I wish they would have more in the way of sandwiches or better cheese/biscuits - even UA's 'trolley by the galley' is generally better stocked than BA.
If you are after something hot you just need to ask the CC to heat up for you (assuming there is something you like!)