First, customs restrictions are nowhere near as draconian as when entering the US, so please don't worry! Second, customs regulations are generally EU-wide as we have free movement within most EU countries.

I understand that informally, if cheese or meat products are in hermetically sealed packages, they are tolerated. However, read this notice for the official view:

http://www.food.gov.uk/enforcement/i...dairy_products

I guess it's probably not worth the bother, just in case you suffer a rare spot check. Good luck anyway.