Hi Bertie,
I negotiated Safeguard into the deal by rounding up the value of the order to a nice round number - I think I ended up paying around two hundred and something pounds for it.
I only picked my car up yesterday so can't comment on the Safeguard longterm performance, however, if the claims are to be believed (and it is backed by a 10yr guarantee for new cars) then I think it should be worth it. They say the car won't required polishing for 3yrs and that the interior upholstery e.g. carpets repel water such that any spills can be blotted up and dirt/mud will be capable of being vacuumed up easily.
It also comes with a pretty decent and comprehensive care kit and holdall.
Hope this helps.