OK, after a lot of digging I found this
DGND3300 - RangeMax Dual Band Wireless-N DSL Gateway
But reading through the manual it clearly states that you must use no or WEP security if using any of the WDS mode, ie what I need to use!
I'm absolutely disgusted that this is still the case, as for business who need to do this want their data as secure as possible.
Not being funny, but what's the point in releasing something insecure, especially when WEP can be cracked in under a minute.
Sometimes I wonder if some manufacturers have even half a brain!