First of all congratulations all round, sounds like you pulled it all off very smoothly. The food sounds fantastic!
Let me give you a little tip if your ice box is too small!
Here in Britain the bad weather is a good thing when catering for more than a few people so I always put a large box OUTSIDE and put covered food in there to keep it cool. We keep our beers outside in a bucket of water at Christmas and New year and anything else that can't go into the fridge goes into the big box or the garage.
We had a white Christmas a couple years ago and I just put everything on a table in the yard, my friend put all her food & beer on the balcony of her flat and the neighbours thought she was having a balcony party!
I live in the Midlands so we are a tiny bit warmer down here but not much as long as its 5 degrees or less you should have no problems.
One pot meals are good for basic kitchens - have you tried the lancashire hot pot yet? We have a regional stew in Stoke called Lobby - lob everything in! We start making it on a Monday and keep adding to it every day - by Friday its fantastic.
You are so right about buffet tables in England though - sausages on sticks, curly ham sandwiches, a dish of pickled onions, crisps, sausage rolls and trifle.
Most people like this because they don't do it every day - I think its so boring. I love to add minty mushy pea dips with roasted parsnips to dunk and as little bread as possible because of the curl factor. If I do use bread I split finger rolls and butter them and then freeze them - why? Because if you put them out frozen and covered on the plates an hour before, they defrost and are still very soft by the time you are ready to eat, this way people can add their own fillings and not have to handle the sandwiches to see whats on them.
I wish you both well for the future hun.