Apples that don't tasty of mushy fluff. How can a few apples, even those imported from France cost more than a watermelon!
Car parts - I don't resent paying a good mechanic a decent labour rate but when I see how ridiculously expensive a tiny piece of plastic is that didn't exist in cars 30 years ago is, I die a little bit inside.
Gluten free bread that doesn't taste of chipboard, and fall apart when you so much as look at it. Even when you pay £3 and upwards its still a bit meh tasting.
Wall paint - however, you get what you pay for. We bought own brand paint for the front room years ago, applied one coat and it was shit, didn't go on well, was patchy etc. Went back out the same day and got Crown I think.
Dentistry - still have to pay for a checkup if you're NHS, and I think hygienist was about £50 the last time I went, all to be poked in the gums and told to floss.
TV license - most of its utter drivel!
Bank charges for going overdrawn - punishing. Though I thought they've had to curb this now?!