Friday I finished work at 4pm, got in the car, clutch down, started engine, gear in...
before i released the e-brake i started playing with my music playlist... this took some time
forgetting i had put the car in gear at this point i took my foot off the clutch... STALLED!!!

what a numpty.. so started it back up and went to drive off...
alternator fault came up, no power steering, thought to myself "great aux belt gone"
parked up, engine off, off bonnet and there it was aux belt had been throw off but still in one piece

when i stalled with the brakes on the crank stops instantly as the gearbox prevents the crankshaft from coming to a slow stop but the other pulleys still have some momentum, this caused the tensioner to pull back to fling the belt off

being at work i have no tools on me, so called RAC for an easy quick road side fix, all i needed was a 15mm socket wrench

rang them at 4.20pm, due to the bad weather they were busy, took an hour for them to pick up
5.30pm they said it will take a while, at 6pm i get a text saying it will be atleast 4 hours for someone to come out

so i rang a friend to pick my tool chest up from my house and bring it to work
by this time it was raining, dark and i was starving
15mins later i got the belt back on and drove home

Moral of the story: RAC are s**t, carry a small tool kit instead, and don't stall