There is a significant error in your understanding of the system Heff, although it's a common one.
Any aeroplane will have an associated maintenance schedule. LAA HQ at Turweston can advise you of the specific schedule for your planned Taylor, although my guess is that it'll probably be the latest form of LAMS, which is in CAP 411.
LAA /CAA / the-law / survival-instinct... all of these require you to ensure that the aircraft is maintained thoroughly and to at-least the minimum standards contained in that schedule. So far so good.
You are allowed as a qualified pilot on a PtF aircraft to do most of that work yourself, or you are also allowed to delegate it to somebody suitable - such as a licenced engineer or one of the many little companies who do this sort of thing, usually very well.
And annually, there is a requirement for a Permit revalidation inspection and check flight. This is not the same as the annual inspection and maintenance - that is your responsibility as owner. It is an audit of your good care and maintenance of the aircraft.
As such your using a permit revalidation as part of a pre-purchase inspection is a good idea. But never ever, once you are an owner, let it lull you into any sense that it stops you having to take responsibility for absolutely everything yourself.
Oh yes, and you'll be glad to know that LAA do run regular courses for its members on how to maintain their aeroplanes. Get on one of those - usually at Turweston, and excellent value, and much will become much clearer.
G