Happily, the Vitesse passed its MOT today! i tried to get the car started last weekend, and thought I had a duff battery charger, but it turned out it was the battery. It wouldn't start at the MOT station but they sold me a new, very reasonably priced one. So I had done nothing to it except top up fluids and drive it there, after not being used for 7 months.
Now I just need to make sure I use it more this year, as it seems I only did a few hundred miles last year (although that did include 2 laps of Silverstone and several trips to Classic Car Night at Jacks Hill Cafe at Towcester, amongst other things...)