Here is a list of UK sites which regularly hold or list competitions.
The Sun – The Sun is a UK Tabloid Newspaper.
Morrisons – UK Supermarket chain.
ITV – TV Channel
The Mirror – News Paper
Cosmopolitan – Womens Magazine
Loquax – Competitions Site UK
Glamour – Another Womans Mag
The Guardian – The Guardian
Online Competitions – Site Lists Free UK Competitions
Facebook – Just search for competitions
Shoezone – UK Shoe retailer, regular competitions
MyOffers – Free UK Competition Site
Socialots – Competitions and Discount Codes
Running Free – Running Magazine with Competitions for Runners
Do you know of any we could add to the list?