kryogenik

You can get extension couplings to join them mate. It's not recommended but I had to do it for the dishwasher. B&Q will have them if they don't have longer pipes.

:edit: there's also a type of coupling that's tapered both ends. You'd cut the threaded coupling off each end and then fasten with a couple of jubilee clips. Sounds a bit Bodgitt & Scarper, but it'll be fine. They fit in tight as hell, the jubilee clip is almost a failsafe.