If your venue allows you to supply your own, then in terms of beer, can you do better than Camden Brewery? Personally, we doubt it, and the boys were able to do us a very good deal. Swigging their Pale Ale from the bottle went down a treat with the food.
For wine, don’t forget Tufnell Park’s Theatre of Wine (which also has regular tasting evenings) can offer great advice, and Oddbins on Kentish Town Rd can supply pretty much anything and everything, including glassware. In the end we went for Majestic in Chalk Farm as they had some great deals at the time, and we found them easy to work with.