International Food Shopping Online
The Brit Store: http://www.britstore.co.uk/ They do Marks and Sparks stuff
The Brit Superstore: http://www.britsuperstore.com/. They do M & S stuff too, and forward mail
Expat Direct: http://www.expatdirect.co.uk/
The British Corner Shop: http://www.britishcornershop.co.uk/default.asp (the cheapest, so I'm told)
A general gateway site for foreign (e.g. Jamaican) foods in England, which sometimes works for Europe: http://www.onlinefoodshopping.co.uk/. If you hanker for Jerked Goat, say.
The Chocolate Trading Co: http://www.chocolatetradingco.com/mainpage.asp
Wiltshire Tracklements (try clicking on "links and worldwide Suppliers": http://www.tracklements.co.uk/
Fortnum of course: http://www.fortnumandmason.com/
Spices of India http://www.spicesofindia.co.uk/
Natco online http://www.natco-online.com/
The Dutch Candy store http://www.dutchcandystore.com/index.php (has Van Houten Cocoa)
Life's Little Luxuries http://www.lifeslittleluxuries.co.uk/
Holland Shopping http://www.holland-shopping.com/
Duchy Originals http://www.duchyoriginals.com/
France Domicile http://www.lafranceadomicile.com/fr/
German Foopd Express http://www.germanfoodexpress.de/index.php
Swissmade http://www.swissmade.com/
Delinostrum (good for Spanish stuff) http://www.delinostrum.co.uk/default.html
The Danish Food Shop http://www.danishfood.net/
Harrods http://www.harrods.com/
The Highgrove Shop http://www.highgroveshop.com/
The Wing Yip Store http://www.wingyipstore.co.uk/
Wai Yee Hong http://www.waiyeehong.com/
Stuff Back Home http://www.stuffbackhome.com/shopping
Scottish Food http://www.scottishfood.com/
Scottish Gourmet Food http://www.scottishgourmetfood.co.uk/
French Click http://www.frenchclick.co.uk/default.aspx