Charley, when I operated GA in probably a far more brutal area than yourself, flying overweight was an absolute no no. Only "Mercy" missions could "bust the rules" but you had to have the absolute best reason for doing so.
In the UK, I cannot see why you ever need to operate overweight.
You can use the alternate rules (planning v inflight) to make it happen, but a routine flight? No.
If it's routine, send in an MOR to the CAA. Cowboys don't do any one any good.