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redhelen, I know what you mean having trained as a chef myself your expectations are quite high. Having said that, I still expect Loch Fyne to attempt to serve their spinach grit free, they hadn't done so today!
bednobs, Northcote Manor used to have shepherds pie on the menu, I've just looked and it is absent at the moment.
I've eaten at Michael Caines Gidleigh Park and the food was good, I haven't tried any of his diffusion restaurants though.
Personally I enjoyed The Fat Duck and have had a few good pub lunches at his pub next door.
I haven't been to JO's 15 restaurants but have enjoyed a few visits to his 'Jamie's Italian' chain, although was surprised that despite being an Italian inspired menu there was surprisingly little for vegetarians.