I realise that I may be branded a liar, but it is true, you really can have an English breakfast at Beleza Restaurant for only R10.
I haven't actually had breakfast here before but on popping in for a drink I noticed a sign posted outside advertising their super-cheap breakfast. I'll certainly visit one morning to give the breakfast a trial run and report back on my findings.
If you're looking for the place, click through to Wikimapia. It's on Kloofnek road, directly in the middle of the satellite photo.