Ian probably put the kiss of death on this one for you Ranj,
"The RNS-C is a waste of effort to get working anyway as they're unsupported and horrendously slow. The disc they run is a Travelpilot (not the DX version) - Its the same as used in some Fiats I think. Ebay for it, I recall I bought a Fiat disc once for a Preface D2...."
But if you need to get rid of it pop it in the post to me with the facia and i'll sort you out the postage