Juddian:
I did nights for many years but can’t hack it after 4am, preferably finished by 2am, that 4 to 6am window is a killer and i don’t how the regulars manage.
Blimey 4-6 am was no problem.The killer was running late for whatever reason and getting caught in the morning commuter traffic around the M25 from the M1 or the M40/M25,after that time. 
