The really nice 'posh' hair dressers in my town (upwards of £70 for a cut and colour) now do standby appointments. I think as soon as people started tightening their belts, they realised they had to give a little. They now do a standby cut and blow dry apt for £15.00 and a cut and colour apt for £25-30 depending on what you'e having done. I never tip as I'm a minimum wage worker and can't afford to. Simply call up in the morning and see what they have. They also make you tea and give you a head and neck massage while you wait. It's bloody fab.
I can very rarely stretch to it, but one of the local nail bars do cheaper appointments as well. Again, depending on what you want done, you can get gel/acrylic nails done for between £10-15 at certain times.
I cannot stress how much I love charity shops. My local Oxfam is wonderful. I picked up a beautiful knee length navy blue Vera Wang dress in there a couple of years ago for £11.00. It's my go-to occasion dress. I can't usually afford to treat myself to new clothes, but I popped back in there a couple of days ago and bought myself to 2 'new' tops. One from M&S (looks like Monsoon - 'tis gorgeous) and one from Fat Face. Cost me £8 for both and made me ridiculously happy.
I haven't paid for liquid foundation for years. I pop into Boots whenever I run out and ask to sample things. The little sample bottles (plural) they give me last quite a while. So I don't stick to one foundation, I try 'em all. It's very cheeky of me, but it has saved me quite a lot of money 
I can rarely afford a night out in town. So every month or so I get a group of friends round to my house for games night and a catch up. It's bring your own bottle(s) and nibbles, and we play Pictionary, cards, Monolpoly, Jenga, etc. Very amusing whilst tiddled. I stop in at Lidl's and buy a bottle of cheap plonk for myself (under £3) and the night's sorted 