Mary,
thanks a lot for the advice
The website already has some information on licensing.
https://old.gliding.co.uk/bgainfo/li...troduction.htm
I'll take a look at some of the items there and if still in further doubt I'll contact them no doubt.
Btw... you have lots of constructive posts and info here in the forum. When I ran a forum search on gliding/soaring/etc... you came up in many threads. Thanks for sharing your thoughts and experience.
Prop swinger,
thank you for the regulation references, it's been quite useful to connect the dots and get the picture.
In the remaining 8 hours of training you will need to do:
at least 3 hours dual,
2 hours of supervised solo,
the 50km/100km navigation flight.
45 take-offs & landings 
Typical EASA-ish stuff.
Not that I care much about flying a few hours more or less, in the end my goal is to fly as much as possible, but I don't understand why they validate roughly half the flight training time to spank you with another requirement.
In fact I was interested in validating part of my flight time because I thought the SPL would take more hours flight training, 15hrs is pretty reasonable anyway.