In message , Bill Borland
writes

In these Regulations, does "sub-surface" have the narrow meaning used
in this group (i.e. cut-and-cover only) or does it include the deep
tube lines?

It covers both and applies to stations such as Birmingham New Street as
well as many TfL stations:

http://www.legislation.gov.uk/uksi/1...ade?view=plain

--
Paul Terry