What is the best tooth whitening product within the UK ?

What is the best tooth whitening product within the UK ?
Crest Whitestrips, you cannot buy them in the Uk but can charge them from ebay (approx lb30) and they will be sent from the USA, they are very appropriate, Its no good buying any Teeth Whitening product on public sale over the counter in the UK as by imperative Chemists etc are not allowed to flog any products with big amounts of Peroxide, so anything you can buy in Boots is probably useless anyway!
bleach
the with the sole purpose drawback is that it will kill you
Talk to your dentist roughly speaking it, they Can give you nouns advice but shop around as prices can be extortionate.