Yay more UK cubers. Try to be colour neutral on everything, it's easier if you start earlier. You've only been cubing for a few months so it should be easy for you. Remember that you can't use stickerless cubes in competitions, so if you want to go to one (you probably won't now, but you will in the future).
For 2x2, learn Ortega. There are many tutorials on the internet, so look around and try to find good algs. Ortega has very few algs to learn and can be very fast. Colour neutrality is very easy with this method.
For 3x3, you may want to look at
this thread for information on other fast methods. If you want to stay using CFOP, then you'll eventually want to start learning full PLL. PLL is also useful for ZZ, BLD etc.
This thread is very good for other CFOP stuff. And as always, try to be colour neutral

For 4x4, learn reduction. It's a really simple method to learn; you don't need to know much more than solving a 3x3. It can be a little difficult at first, but it doesn't take long to get used to.
Welcome!