It's ok, as some are running on 275kv. I was following a L66 line from Harker substation north of Carlisle by the M6. I also noticed one of the L12 lines in Yorkshire was a recently replaced L66 line, good old google streetview to the rescue. Just so you can track it this old line starts at Norton substation and just follow the L12 line, it does switch with some L6s too featuring some L6Ms. I believe some L13s were tested in Saudi Arabia, where though I don't know. Would be really good to see them so lets hope this Kings Lynn extension still happens.
best regards, Matthew