B SERVICE FOR 2005 E CLASS E320 CDI

Hi guys

I have been quoted the following prices, do these seem about right do they tend to vary? also is it worth paying double to keep my Full MB service history?

MB Specialists Bridgend http://www.mbspecialists.co.uk/

£410inc VAT for B service and Auto Transmission fluid change.

SK Automotive Swansea http://www.skautomotiveltd.com/

£570inc VAT for B service and Auto Transmission Fluid Change

MB Delaer

£860inc VAT for B service and Auto Transmission Fluid Change