Dougie
In theory you can do initial training in your own RW - and I have it in writing from the CAA. However, at the moment, it is probably impractical.
The LAA are not relevant to the discussion. They have made it clear they want nothing to do with helis. It is a shame but I can't see that changing.
If you learn on a 22, then get a type rating (you will have to do that at Southern Helis BTW) you may not save anything on training, but you will have a heli to fly at a reasonable cost thereafter.
Mark