not managed to get it fixed.
It isn't an issue with the disc as I have two 2 discs and both come up with the same error
Spoke to a friend of a friend who is a car mechanic and they have advised that I need a new DVD unit that is under the seat unless I can find someone who is willing to take the existing one apart and give it a full check over.
I have not managed to find a second hand unit yet and definitely not seen any for around £50!!
Just leaving it just now as I have sat nav on my phone, but it looks like it will be a main dealer repair unless i get lucky and find a second hand unit and someone willing to fit it.