As far as I know only Cabair do approved helicopter groundschool in this country (though one in Florida (Helicopter Adventures?) does so also I believe).
However the advice you have from the CAA says you only have to
pass the exam, implying no approved course. Thus if you get hold of some notes you could self study. If you do so and get stuck, either look to Cabair for tuition or email me - I know someone who could probably help (and for the moderators, no I am not advertising my employer, the first person I would suggest was a colleague in SFT but now works for a rival). He is ex-Bristow groundschool, ex-army and North Sea. My helicopter P of F is a little rusty
Best of luck
