If you're looking for a full English breakfast while you're in London like I was, then just go to Terry's Cafe. I had The Works, which I highly recommend if you want a little taste of everything (plus you can't beat the price). Also, they serve Monmouth coffee which is absolutely phenomenal...I literally couldn't stop drinking it. I think the best aspect of Terry's Cafe, though, is that it's still very much a neighborhood institution. I went fairly early on Monday morning, and besides me, the waiter knew almost everyone by name as they came in to order. It's on a quiet street, unpretentious, cheap, and the food is so delicious - basically the ideal breakfast cafe.
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