I understand that Simon Spare (S&T Wagon Works) 82 Clifton Way, Hinckley, Leics, LE10 0UZ, still has a few kits available for a diagram 6 3 plank wagon in 7mm scale. These are resin kits and if they are anything like Simon's previous productions, well worth having. Price £18 plus £1 post, which is entirely reasonable given that these are quality.
If you want one do not delay as it's a small batch and they're nearly all gone. Simon may be open to ideas for future GCR kits, let us hope so!
By the way, if you are not already a member of the GCRS (and more particularly the GCRS Yahoo Group) it's well worth joing as you are likely to get earlier warning of items like this.