AFAIK mk5 very late versions only got RNS-510 version A (my Eddie was one of them).
A version C being from 2010 came with a newer model, either Golf, Passat, Tiguan, Touran, etc...
If it has a star button, it's a LED version so it's good enough. 300 £ should be a good price if it's in mint condition.
By the way, I managed to sell my version A in mint condition and fully updated for that price. I offered the installation.