All I can say is that if you use a UCCC or garage affiliated to them then be very careful that you find out in advance exactly what certain items will cost you.
After being vastly overcharged for sparkplugs I wrote to the MD of Unipart asking for an explanation of their pricing...they did not even bother to reply !
The garage said they charge what Unipart tell them !
So.. be warned...UCCC will overcharge you and offer no explanation.

Brian