Most of mine have been mentioned but here's one that hasn't - think about moneysaving when deciding what hobbies to pursue. For example I used to love travelling, scuba diving and skiing but now I'm into dog walking and gardening. I'll always have the memories but my lifestyle now is much, much cheaper!
So if you do like a drink, brew your own wine. You can get all the kit pretty cheaply at Wilkos and once you have it, it's pennies a bottle. So far I've made raspberry wine which tastes great, and I'm about to make rhubarb. I'm also planning to go foraging for elderberries.
I grow a lot of fruit and veg and enjoy bottling things and making jam. I reuse old jars and lids from shop bought items and have never had a problem. Put a pretty label on some jam from garden fruit or foraged blackberries and these make nice little gifts for friends and neighbours.
Having cheap, time-consuming hobbies also keeps me out of the shops!
I have a professional job and have to dress nicely for work. I buy from charity shops and also M and S in the sales (I actually thing they have a lot of good things in now and good quality for the price). If I get sick of something I put it away for a while and often find myself thinking oh I'd quite like to wear that dress again and get it back out. Almost as good as new clothes.
Always Google for money off vouchers. Switch your bank account from time to time to get cash rewards. I've had £100 from first direct and £150 in gift cards from M&S bank. Switching online nowadays is easy and at my work we can enter new bank account information in the system ourselves.
Have a few months where you don't buy anything except food, transport, bills, gifts and toiletries. I tried this as my New Years resolution last year but only made it to April. Still it made a big difference!
When doing up your house try to do what you can yourself to save money and get expensive paints colour matched. My local paint shop matches anything with jonstones paint (brand name is something like that) and it's excellent quality. Don't rush into doing a room up but really think about the best most cost efficient way. There's a Facebook group called DIY on a budget that helps although they're a bit too into sticky back plastic for my liking.