Given the new contractual arrangments with EASA Part M its fairly clear who is responsable for what, where, when and how. If you keep your end up of the contract you should be bullet proof!
You need to wake up to the reality of much of UK GA maintenance.......... tick the boxes but do half the work. Part M will change nothing. It will always be up to the
aircraft owner to make sure the maintenance required for safe flight is actually done.