I assume you are referring to Phil Deaves' site. Spartan or not it is the most comprehensive listing available in one place, albeit with some errors.
A list of current ELRs is most readily available in the Quail series of track diagrams. Each volume has a page or two listing them alphabetically. BR did publish lists but no one now seems to have a comprehensive listing.
The Network Rail link goes to a 'snapshot' of the Sectional Appendix entries at the start of CP4. I would anticipate it will be updated at the start of CP5.
John Lacy, Webmaster & Publications Officer, Signalling Record Society.