Good Luck
Hi Jake,
You've had most of the answers here already and for once there is some good advice here (you'll soon learn that most threads on this site descend quickly into abuse and have no benefit to orginal thread!)
Anyway...my bit if advice to you....do everything above....and save money like mad!!!! You'll get no change out of £100k and anything you can do now to help reduce the stress when you start training is worth it. I didn't.....I started training at age of 28 and for all intents and purposes it made me bankrupt. If it wasn't for help...it would be a different story.
The job is immense though, it is well worth the investment. I obviously don't know you're personal circumstances...but if you're gonna need the cash then it helps to be prepared.