Hi Noel,
No just gave up in the end,. really annoying. that the left hand buttons dont do anything.
i think in order to get it working i had to turn something on in the coding, it was a bit random, but the MFD just started working.
ill get VCDS back on it tomorrow night and let you know what i had changed.
im thinking to put my old head unit back in anyway, as im not that keen on the RNS510. the satnav is rubbish and menus are very awkward to use while driving.
if someone else knows how to get the MFSW volume buttons working it would be a great help.