Great advice from AMFM there as well. I can't believe I'm writing this, but I've been very fortunate not to get a puncture on the way in to work. sounds like you will be going on a course to learn to change the inner tube, be worth making sure you have a spare inner tube on you and a pump.

Also don't forget lights and of course I'm sure you have a helmet. Decathlon at surrey keys tend to have some things that are not too expensive if you start buying things.

Also if you need anything repaired or advice the guys in Vaidas by Honor Oak Park station are great and very reasonable. You can pay a bit more to buy stuff from there but I find it worth it for the advice, and if you want a new tyre eg they will fit it for you.

Good luck.