Cross River Night Buses

[E400]

Cross River Night Buses
Following Ace Travel's demise in February, Stagecoach took over the running of the 500 and 501 cross river night buses on an emergency basis. However, as was recently posted on the Ace Travel thread on this forum, it has been noted that Merseytravel intends to withdraw the last two remaining night buses as of 18th April 2015:

http://www.merseytravel.gov.uk/travellin...ges--.aspx

The reason I have started this thread is to see whether anybody knows the answer to the following question:

Is there a law which requires a 24 hour public transport operation between Liverpool and Birkenhead?

The general consensus is that there is, but I have searched the Transport Act, County of Merseyside Act and Mersey Tunnels Act and cannot find any mention of this requirement.