My daughter did GTS's Guildford Summer Youth Project holiday course this summer. Held at The Electric Theatre in Guildford, the children learn to stage a mini musical in one week.
This year for the younger age group it was Disney's The Jungle Book Kids (a two week course for older children (The Sound of Music) was also running).
Over the course of 5 mornings the children learnt lines, songs, harmonies & dance routines, culminating in a performance for friends & family on stage at the theatre. My daughter loved every single second of it and has been singing the songs and performing the routines ever since! I thought it very good value for money (there are some optional extras - T-shirt, costumes, performance photos - which add to the cost but they aren't compulsory). The GTS team were extremely friendly, very professional & clearly very talented. It was very exciting for the children to tread the boards of a real theatre too, a great venue. I would highly recommend the course.
My daughter is already looking forward to Summer 2013 where the shows on offer are Fame, Jungle Book, Joseph & Cinderella!