Thanks everyone, you've given me food for thought. We are only a small company and don't earn much as directors, only 2 employees.
The only advice we had from our accountant was to do one after the other and leave it a few years, but to be honest I'm done moving every couple of years, so it's not ideal and I believe will be quite risky to argue with HMRC.
I'm very inexperienced with pensions, so I'll be doing lots of reading up on those options. I am more interested in the ltd company option, but again, more research is needed.
Yes, Pete, the land is the garden of our current property, although confusingly isn't in the same title! Not sure if that will be problematic.
Oh and we are in SE London. The land with PP would fly off the shelf but it's not really want to do.
Anyone know of any accountants or specialist financial advisors in this field? I can badger them too!!