I have an enquiry about sewers and general underground circuits. Is there a method of generating ordinance survey maps that include where main (and if possible other) sewers lie and intersect. The same with other underground circuits, maybe electrical or tube lines?
Ordnance Survey tend not to map underground services such as sewers and electrical circuits. For this type of information you could try utility companies or local authorities. They may be unwilling to share the data for national security reasons, but explaining exactly what you want the data for and being realistic about how much data you really need might yield a positive response.