Thanks Philistine, a lovely puzzle. Completed this morning (UK) without help from here for once, but with a few guesses that I couldn't parse until I read this, many thanks to all contributors.
Like others, I had to search for a recipe to get all the ingredients - I then spent too long trying to fit 'chicken' in somewhere! Many COD contenders: politically 5d was good, loved the double reference in 14a and the use of 25a in 4d, but I think 17a wins it for the oblique allusion to Fawlty Towers
Best wishes to all and sympathy to all back sufferers. I've met those chairs in ee, I usually wait standing up because they are so awful (and I think it keeps the staff more aware of you waiting)