cheesebiscuit: i want to hug you. 
No problem...Here's part two
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Burgers & Diner Food
Right, I'll prefix this with, I hate the thick meatloaf style patty you get sometimes so I don't like GBK at all, I'll try and describe the burgers a bit so you know what you're getting
All Star Lanes - Burgers good, Milkshakes and Cocktails much better! All their desserts = lush.
http://www.allstarlanes.co.uk/Byron - Best burger in London hands down for me, cooked to medium perfection, lovely side salads good bun, and amazing courgette fries. This is the place to go if you want a burger imo
http://www.byronhamburgers.com/Sticky Fingers - Surprisingly tasty! Their Nachos fondita come with a passable attempt at queso (not really, but it tastes good and tries hard), their burgers are really good and are half price on Mondays, the bun is in a brioche style which is really nice. I also quite like their fajitas strangely enough.
http://www.stickyfingers.co.uk/Chicago Rib Shack - I've only been there once so feel this is not a fair comparison. I thought their ribs were "okay" not terrible but not amazing. They serve something which pretends to be iced tea (it's kind of lemony), their ice cream cake is fantastic. The onion loaf is the size of a house brick (but surprisingly good), personally I don't think it's worth the money at all but YMMV -
http://www.thechicagoribshack.co.uk/#!home/
Big Easy -
http://www.bigeasy.co.uk/v1/index.aspx Now opinions vary on the big easy but they do a decent lobster imo, especially on half price lobster night
Bodeans - The only place to get BBQ in London.
Lucky Seven - Milkshakes to die for.
Old Street Diner - Pancakes! Their pancakes and maple syrup are totally yum, everything else meh.
Tapas
http://www.saltyard.co.uk/ Modern cool, high quality delicious.
http://www.losmolinosuk.com/ Friendly, neighbourhood, also delicious, get the fabada, so gorgeous.
Menu changes daily but is always delish -
http://www.cambiodetercio.co.uk/cambio-de-tercio/tendido-cuatro-restaurant.html Fish & Chips
Pain to get to but -
http://www.twobrothers.co.uk/Love love love!
http://www.poppiesfishandchips.co.uk/The classic -
http://www.timeout.com/london/restaurants/venue/2:1175/masters-super-fishMore Italian!
Totally forgot -
http://www.boccadilupo.com/ and
http://www.zuccalondon.com/Horror!
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Vietnamese
Cay tre -
http://www.vietnamesekitchen.co.uk/caytre/Bahn mi - Keu! (it's opposite Cay tre) I get lunch from there about twice a week
Coffee -
I know, I know, a cliche but it's still lush -
http://www.monmouthcoffee.co.uk/If you go in the morning I'll be in the queue
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All press
http://www.timeout.com/london/restaurants/venue/2:27956/allpress-espressoOr I'll be in the queue for a flatwhite at present -
http://www.prufrockcoffee.com/Ahhh, I can't think of anything more, but there's all the trendy places like Viajante