Climbing as a hobby, and now as a birthday cake?  I faced the challenge with the same determination the children face the wall!
I built up layers of chocolate and vanilla sponge cake, sandwiching them together with buttercream and jam, then carved it to shape with the children’s help.

I managed to create a cement-coloured buttercream using cocoa and black food colouring, and covered the structure with it, leaving the surface rough, like the real climbing wall at The Rock Club where they climb.