I think the late-finish service will be scuppered by the need to get
home all the train and station staff who presently manage to use the
last National Rail trains (signalling staff are usually on nights at
this time) to reach the Home Counties. The only way seems to be a
massive increase in the LU staff taxi system and, apart from the cost
involved, there's doubt that sufficient capacity exists in the London
night taxi trade to cover this.

Of course many will ask why LU provides taxis in the first place and
will consider it the employees' own responsibility to get to/from work
as with other organisations. However LU "is where it is" on this, and
the taxis themselves are long-established, having replaced the staff
coaches which had taken the place of LT's own staff buses (ordinary red
RT types) which in turn had been put on to allow the withdrawal of
staff trains (ironically to allow longer engineering hours).