LONDON
Central
Burgers and Cocktails, Marylebone
Flat Iron, Soho
Grillshack, Soho
Kua’Aina, Soho
MEATLiquor, Marylebone
Patty & Bun, Marylebone
Tommi’s Burger Joint, Marylebone
South East
Tongue ‘n’ Cheek, Brockley Market
West
Byron Westfield, White City
REST OF ENGLAND
Hampshire
7Bone, Southampton
The Boozy Rouge 
You guys can’t rate 7Bone if you haven’t had a Rockstone Burger!
http://www.therockstone.co.uk
I second Max! Rockstone burgers MUST be sampled! He’ll hit the top, I’m sure of that 😉
Thanks both. We have been to the Rockstone, but not since starting Burger League. Will be happy to come by when next in Southampton.