1) Take advantage of 'hot deals' websites - these are a great place to find discount codes and various other offers, I never buy anything without a code!
2) Look at your direct debits - is there anything going out you don't make use of, or need anymore? For example Amazon Prime or your Sky/Cable subscription? These can easily creep up if you don't keep an eye on them.
3) Sell anything you don't need! I always declutter in the run up to Christmas to make room for more plastic tat, I mean lovely presents, so why not make a few pounds in the process?
4) Shop around. I personally support local business where I can, even if it means paying a bit more. But if that's not possible, then definitely do a bit of research before purchasing - it definitely pays off.
5) If you need to make a bigger purchase, look for 0% payment deals (unless you are about to take out a new mortgage or something in which case you probably wouldn't want to take on extra credit!).
6) Certain things I always buy second hand - football boots and wellies are prime examples. They get trashed pretty much instantly anyway, so where's the harm?
7) Look at things like energy providers - use compare websites to see if you can get cheaper deals.
8) Investigate current accounts that have cash back and/or other benefits - they can make a big difference.
What are your top saving money tips?