Hmm. I guess I assumed that the old 2-MVA T41 was (at least temporarily) wired up to the new GIS buildings, but now that you mention it that doesn't make much sense. The new 5-MVA T42 was already on-site before the old busbars were removed, so it's unlikely that the old transformers were ever connected to the new switchgear.

I need to go and have another look at the station anyway because I think it's been further upgraded since I last mapped it…