Mizter T wrote:

If there ever was to be a diversion of the DC line service, then it
could be mitigated by what Andy suggested - a Watford to Euston
shuttle service. Not sure how do-able it would be to stop it at
Queen's Park, but that would make such a thing x times more useful.

I think a Watford to Paddington shuttle would be most useful, allowing better
connections to the GWML and Heathrow from the WCML (tube between Euston and
Paddington is a nightmare if you have any luggage).