OK, so I think "it's a nice evening I'll pop round to see how my mates getting on with his decorating and show him the new bike". He asks for a hand removing a window sill. No problem says I and we get stuck in. Half an hour and a trip to the DIY store later I'm busy re-laying the three courses of bricks that fell out of the inner cavity and getting a tad worried about how poor my plastering skills are. Never get involved in other peoples DIY.