There will of course be the usual doubtors but the DVLA figures for September 2015 are as follows.
which I believe to be fairly accurate
NOVA SR
Sept 15 inc NI........... 151
Sept 15 excl NI............ 136
Sept 14 excl NI ........... 134
Licensed SR's have been falling 15% - 20% year on year....
except this quarter where a very small increase in numbers.
Of the ones I know of , many very low mileages between MOT'S.
Typically 1-2 K
Some less than 10 miles per annum
Highest annual mileage 12K