I run Tools Shed, a garden tool recycling project, for the Conservation Foundation. The broken tools are fixed in the workshops at Wandsworth Prison and will be given to schools for their gardens in the autumn.
The RHS is letting us trial a collection scheme at Hampton Court, picking up tools after the show close.
If you're working at Hampton Court or know anyone who is and might have any broken tools for us, I'd love to know. We'll be round with a trailer on 15 July and can pick up from the garden or maybe the RHS will let you leave tools with them.
There's more on the Conservation Foundation website - take a look at my profile...