I suppose my question is as to whether it’s worth it.
That link from RichardV6 shows it to be 40 pages of possibly largely generic stuff. However, if you want it as part of the "substantiating period documentation" for your car, I say just go ahead and make a not-too-derisory derisory offer. If you're successful and also apply a discount voucher, you'll get it for not much over half the price of a tank of fuel. And where/when are you going to find another ?
