Cafe Silam, SE17 2AX
Greasy spoon cafe on Westmoreland Road in Walworth.
secretlondon has visited a few times, most recently in March 2012, and it's always been good. They don't mess you about with "set breakfasts" which have toast and coffee extra. It can be hard to get a table as it's quite small, and it's clearly popular with the local builders.
Last time I visited I had a set breakfast of two eggs, bacon, sausage, mushrooms, bubble and squeak, beans, two slices of toast, and coffee (£5 all-in).
secretlondon's verdict: I've been back several times, so recommended. I think it's a bit of a find.