I know its a longshot but does anyone have any styles etc for the WK4 ?

Try http://www.synthzone.com/midi/GEM/WK-4/ You may already have these styles but check them out anyway.

Thanks for that my WK4 was relegated to the Attic thinking it was broke, till I managed to track down the os for it most of the disks I had with styles went missing. Anyhow it's working again apart from the backlight gone on the display. Might be the inverter.