I'd check the warranty first. Really annoying as it's a bit like blackmail.
Same as the 4x4 service, was quoted as around £250 more than the fwd model. £250 to check the transfer box oil? I cant image the rear diff will need looked at sooner than every 5 or 10 years.
Should be an interesting conversation when they explain what has to be done in the first service as they couldn't tell me what wasincluded for either service. Not too reassuring when you need to point out to the salesman that it wont need spark plugs in a service because IT'S A DIESEL!!