I can mirror what kev has said, with a couple of comments (not to be taken as criticizms!!)
the £50 - is for families - if 5 people go its 25 +5 for the wood, still exceptionally good value!
Bard is clear that its an introduction to making bows and actually you need to be very determined to get one finished in the day, the tillering takes a while and because of the space and limits of equipment people tend to arrive at the same points at relatively similar times so with us we have 5 people wanting to tiller at the same point and the day running out. Bard was great and stayed behind quite a while to let us cary on - but still if a group go you need to really crack on to make a nearly completed bow. Worth bearing in mind for people who dont have any space or tools at home etc - i still have not made myself a tillering stick (although do now have 3 bows nerarly ready for tillering).
The location is smashing too, beutifull little spot.
But.. from what i understand there are no more bow making courses this year - i could be wrong but thats the impression i had. Of course like the one we did you could see if bard will put on a special one for you, this is what i am hoping to do with the leatherwork one - although not many people seem to be interested so perhapse its not got legs?