Having corrected my frequency setting error - I blame my stroke and muddled brain (!) - and reset my PC to internet time (after the Virgin Media broadband worked again), I am now on frequency and accurate time on 6m. Just looking for some spots now! No luck as yet.
UPDATE 1640z: Completely separate from my 6m WSPR kit (PC and FT817), I am on 10m WSPR TX running 500mW from my WSPR-AXE-CW beacon designed by W5OLF. Plenty of spots from the USA already on 10m WSPR.
UPDATE 1704z: Still no luck, so far, on 6m, but I shall be on all night, ever hopeful. At least there is some activity from the UK from IO92 square which should be in range via aircraft reflection. Maybe I'll get lucky. At least I should now be on frequency and time.