I have been this outlet before and they got Tods, Burberry (I can get same season clothes), Hugo Boss, etc. Not too big but it is worth to go if you have time. You can take a train from London downtown and it takes around 40 mins.
For the big Burberry outlet in London downtown, they got a lot variety of clothes but most of them are out season. I don't remember the address but you can access by bus or metro.