On 24 Mar, 21:41, wrote:

Steve Banaghan did mention it at an Abfly meeting last October, but
said it would probably come in December 2010.

The logical conclusion to this in my view is that the infrastructure
work should be done to allow through running to St Albans on a half-
hourly 8-car service to/from Euston throughout the day with a few peak
extras, and to withdraw all stops south of Watford (and some at
Watford) from other services.

Neil