In the past I've just dropped them a line at the generic address with a covering letter and a cheque for a fiver. They photocopy everything they have relating to your car and a fat brown envelope arrives a week or so later.
Hi Mate..Or you can go on their website and request a V888 form..There is a downloadable version that you can fill out and send off...With your lady...Ziga
It used to be a free service - twenty of so years ago!! I got a very faded photostat of my Rover P4 docs in 1990-ish, which I still have (and the car).