I've been to GBKs a number of times and the Putney one is no different. The burgers are decent but they're certainly not amazing. The burgers are pretty big, but the meat and buns are so high that you basically have to crush the whole thing down with your hand to fit it in your mouth and if you cut them in half they fall apart, which always irks me! The meat also tends to be underseasoned. Fries are good but they are extra, about £3. Add that onto the cost of your burger (£7-9) and a beer (£3.80 for a small bottle) and you've got a pretty expensive meal. You go up to the counter to order, like at fast food chains, so you're not paying for service either. You're better off going to a GBK if you've got a discount voucher: Google "gourmet burger kitchen voucher" and you'll find plenty.
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