Cheese.
I try to restrict myself to a piece of 'real' cheese from the cheesemonger (both Glasgow and Edinburgh are fortunate to have both IJ Mellis and George Mewes) have as an occasional treat. I do, however, have a big thing for cheese on toast for which the real cheese would be an expensive extravagance. The big blocks of "Essential Cheddar" from Waitrose are ideal for this.
Oh, and yes Ashcombe, olives! I can polish of a complementary plate of them in seconds. I do remember Mrs Nicholson, one of my primary school teachers, telling us that olives were a grown-up taste and we probably wouldn't like them. That Christmas we went to visit parental friends who were a bit posher than us and they had dishes of olives out. Never having been one to be told what I would or wouldn't like, I tried one. And another. And a third.. Before long I'd scoffed that plateful and a couple of others.