You've had a month to learn about cable capacities and voltage drop - why haven't you used it?
Watcha misery guts - ru my dad?
edit: ok ban-all-badgers I'm going to edit my reply slightly as you are "the don" of sheds... I use this site sometimes as a reference not always for projects being done at the time, so I can look back to see where I got to on a project. I don't always have the time to follow stuff through. Hence why a gap of a month or two crops up, could be a year, doesn't matter when its all down here in 1s and 0s - hope that makes sense