Without the receiver lightening cuts it's not a No5 LE. Look for cuts at the Knoxx form and around the rear of the receiver.
Drilled and tapped for a scope hurts value as I'm sure you know.
The so called "wandering zero" the No5 is reported to suffer from is greatly exaggerated. The Brit Army did not want to get stuck with a bolt gun as the standard while the rest of the world went select fire auto. They hand picked No5's to demonstrate this so called wandering zero and played it up big time.
ETA: That Serial Number "TE0062" does not sound correct. There's a Tennessee importer that brings in some faked up No5's that uses the TE prefix a lot. Upload some pic's