Any chance you could put together the menu...and let someone on the London front do the shopping?
If you got the menu together well in advance, they could easily tell you what's available and what's not.
Now granted, I'm crazy for pastries and desserts and I can't WAIT to get to England and try some clotted cream! I have friends in London and I'm already scheming on how to incorporate that in a visit, somehow. smileys/smile.gif
Since you could go go vegetarian with the menu, lots of those issues with the oven won't necessarily be issues. Boil is the highest setting on the oven, etc. But I've included a link below with oven temperature conversions, just in case.
When I have favorite recipes, I always e-mail them to myself. I have a folder just for my favorite recipes so I have them on hand whereever I am (I made scones in Mexico for the Brittish innkeeper who'd been pining for them...). You could pick the majority of your recipes and convert them, stick them in your e-mail and then when you're ready to go...easy, easy.
Here's a quick and easy dish my friend made that could be really fun. (Click on the link for a photo) The shiso leaves are not integral-- you could always serve it on top of some other greens or herbs that would compliment the soy sauce/tamari (a base of lettuce, and then shredded cilantro on top maybe). This one's more like assembly, but I'll be doing it again. You see, it presents well.
Block of soft tofu
tamari/soy sauce
greens
wasabi
optional: edible flowers (nasturnum has a nick spicy kick)
And for dessert, I went to a dinner party once and absolutely slaved over a dessert. Someone else brought dessert too (surprise!), and everyone made a huge fuss over her fruited fool. It took her all of like 10 minutes to put it together and this group of serious gourmands was in heaven. Fools are easy, easy, easy and you won't have to dedicate a bunch of time to it, yet it's got a big pay off. (Gild the lilly with a little alcohol in the whipped cream or the fruit, if you want.)
Here's a recipe:
http://www.joyofbaking.com/EnglishFruitFool.html
Here's a couple recipe converters:
For measurements:
http://southernfood.about.com/library/info/blconv.htm
For temperatures:
http://italiancook.ca/conversion.htm