Today

Tried to change oil today but sump bolt won't budge , been torqued too tight by someone !

Ouch, Did youy manage to undo it in the end mate? What did you try to losen it with. I used Plusgas on the stubborn bolts on mine and it's recommended by me

Put yer back into it lad!

  Best case is it'll come off. Job done.
  Worst case is you snap it - drill and tap and a new bolt and you're laughing!

 Either way, don't let a sump plug beat you!

Put some oil on it?   

get a breaker bar on there