I took my 10 yo DD and her friend to a Christmas market today and payed £20 a head for a Christmas craft and treat decorating class. It was for 2 hours. I was rather disappointed. They made slime - this was grey and sticky/slimy - it looked like slugs. Not sure exactly what went wrong but we've often made it at home with no problem. They used glue, bicarb, contact solution and green food colouring. They also had one of those thin wooden ornaments (plywood?) to colour in with felt tips. Finally, a mini gingerbread man and cheap fairy cake to decorate with icing and sugar strands. I mean, I guess I got childcare for them both for 2 hours but would you have expected more?