The NXEC site at 11pm still had the 1.30 pm notice.

On FCC's site, which apparently CAN run a railway:

"21:30 Tuesday 4 March Great Northern route: Lines between Hitchin and Biggleswade will be closed between Midnight tonight and 06:00 tomorrow to allow overhead lines to be repaired. Some late night and early morning services will be cancelled and/or replaced with bus services. Please click 'further information' below for full details."

I was not in the least surprised when the 0610 was cancelled this morning.

Somehow, I suspect most of NXEC staff were.