I see that validators have at last been fixed at the entrances to the
platforms at Euston that previously lacked them (platforms 1-3, 4-7 &
12-15). I wonder whether Virgin will accept PAYG when they run special
timetables that include set down stops at Watford Junction?

The EMT gateline at St Pancras International has also been upgraded to
Oyster (presumably for Thameslink diversions.)