This is the current guidance on the HMRC web site
[http://www.hmrc.gov.uk/customs/arriving/arrivingeu.htmURL][/URL]
Which is fine except they operate an advisory limits at points of entry that is as follows
3,200 cigarettes
200 cigars
400 cigarillos
3 kilograms of tobacco
110 litres of beer
90 litres of wine
10 litres of spirits
20 litres of fortified wine (for example port or sherry)
Beyond these amounts they will give you a seriously hard time
There do appear to be changes to the Duty Free allowances for the year from April and no doubt these will be changed again next April
http://www.taxfreetravel.com/UK%20duty%20free%20allowances