thanks again guys.
Chris - this work can be done in all weathers, and averages out at £180 a day for a reasonably leisurely pace. Like I said, I have done the work in 9 days = £300 a day.
Going by what some of the other guys have said, £13500 isn't a lot for this type of work. However, if I got a serious buyer with cash waiting I think I would consider it.
As for relocating? Well if you must know my wife really wants to move back over to Northern Ireland. We have a holiday home on the coast there so may move to it while my son will keep things running over here. I have no mortgage ion either my home nor the holiday home so if I sold here then I will have a few pounds to keep me going - provided the tax man doesn't come after it all.