sit down and look at all your bills, make sure you're getting the best deal.
plan your food shopping and don't go when you're hungry
take advantage of deals and freeze things. you can save a huge amount of money by good deals in supermarkets (e.g. 2 for 1 etc)
maybe look at different supermarkets. i was shocked at the prices in farmfoods which i'd never been in before. i wouldn't do a whole shop there but some things were amazing, eg cornettos for 20p when bulk bought. i'd been buying them for over £1 in a petrol station. very different.
do simple things for free or near free, like go to the park, fly a kite, go to an area of outstanding beauty, go swimming in an outdoor lido, go to the beach
for me a lot of my money goes on convenience buys so i guess avoid that
things that work out cheaper long term eg get a mooncup instead of paying out for sanpro constantly
look at supermarket clothes, some of them are surprisingly nice
get a cheap hobby like couch to 5K or something similar!
good luck
xx