The BBC food websites are a great resource for recipes, explaining methods or ingredients:
The BBC conversion guide is helpful for oven temperatures, cake tin sizes etc.
Delia Smith’s website shows you how to line cake tins etc.
I generally buy any unusual ingredients in the English Market in Cork. If I can’t get something there I use the following sites to buy online:
I buy my pasta and tinned tomatoes in bulk. It is much cheaper than buying in shops and I get them from The Best of Italy.
I buy marshmallow fluff and liquid smoke from American Food. I use liquid smoke when making pulled pork to give it a barbeque flabour when cooking in the oven.
The Cooks Thesaurus is invaluable if you can’t get a hold of a certain ingredient. It will tell you what to use as a substitute.
Ottolenghi’s online shop will have all the hard to get ingredients that he uses in his books. Be warned, it’s not cheap!