Look here:
Technical leaflets
Specifically at TL2.09 although this document is now out of date. It states the OLD regulation that sole owners only may receive instruction but current regulation allows that members of a group owned permit aircraft may also receive instruction. The LAA are a little slow in updating their docs.
Quite a lot is changing with permit a/c. Until recently you could not fly a permit a/c over a built up area. Period. But now you can, complying with the same rules as certified a/c. If in doubt about any of these regulations, call them.