I'm now as up to date as I can be, though there are some notable gaps for the last few years that I will ask individual recorders about on Friday.
The 87500 records in the database come from 370 tetrads (2x2 km squares, the mapping unit I use) and 623 1x1km squares. The 10 most widely recorded species are: Silver 7 (179 1x1km squares), Large Yellow Underwing (175), Flame Shoulder (170), Brimstone Moth (169), Common Carpet (153), Dark Arches (150), Green Carpet (148), Drinker (146), Small Phoenix (144) and Common Marbled Carpet (140).
There are surprisingly few obvious patterns, other than recorder coverage. Most of the rarer species except for a few on the coast are just too under-recorded. Yellow Belle is a nice exception!