RF5s seem to be around £35 inc postage at sailboats etc. So .... £20 inclusive?
If that's OK, PM me your address and I'll stick it in the post.
Alternatively, that spinlock pxr one looks very neat and, since they changed the cam design, works flawlessly. Looks aside, its other advantage is that it has no fairlead to wear out (the RF5 should have been designed with a metal liner in the fairlead really). The downside of the spinlock is that it's a b*%%£r to thread.