Cornerstones are offering this:

Are you a children's writer and stuck on how to perfect your MS for submission? Then you might want to go on the Cornerstones next self-edit workshop. It's taking place 11-13th February and is the only one for children's writers that they're running next year. It's a two-day residential course at a 12th century manor in Oxfordshire. The workshops are kept small so you get the best attention. They're also bespoke where your material is used in class. If you sign up before 15th December you qualify for the 10% discount. Call, 0208 968 0777, or email helen@cornerstones.co.uk for a programme.