So...
Like many others I passed a UK PPL (A) and have been regularly subjected to CAA Class 2 medicals. As the aircraft that I fly most often is now EASA certified, I have had to have my licence changed to an EASA one, although it clearly makes reference to the UK PPL that I gained back then.
The wording on my licence documents (why there are two, I knoweth not) implied that I only needed a Class 2 for an EASA plane. In other words, no medical, no flying my plane.
So what's changed?