In reply to Keiran.A:
> as i hang in a harness all day
Have you thought about getting your weight off the harness and onto a bosun's chair? Petzl Podium if you have the dosh (expensive, but excellent), homebrew plywood/foam/cordage affair if you dont.
> at work
Work work? Y'know you should be using worky type gear really right? WaHR, PUWER, risk assessments, method statements, rescue plan, yadda yadda, blah blah.. <HUGE yawn!>