The table below shows the current results and also the last totals posted by Dave 18 months ago and there is a marked drop in the number of cars currently licensed and on the road.
Dave used to lump together the cars on sorn and cars just listed as unlicensed. i've broken this down further and listed these 2 catagories separately as most of the unlicensed cars have been unlicensed for many years, in some cases 10 - 20 years and they are probably long gone or very unlikely to be put back on the road.

Even if we allow another 20% for cars we don't know about but which may be out there on the road we would only have an extra 12 road going cars and another 43 on sorn..... no wonder you never see any 1st gens on the road these days unless you go to a show.
Spares in the UK are also becoming scarce compared to 6 or 7 years ago and parts cars that we used to buy for a 100 quid are now getting expensive.
The days of cheap 1st gens are long gone.