This is a lovely website i came across today, the Hornby Railways Collector Guide features all Hornby and Triang rolling stock from the year dot. There are some fascinating models in here, i never knew Hornby did a Class 77 model but indeed they did! It was discontinued in the year i was born which probably explains why i've never seen it before.
The Class 81 model looks very interesting too (see right). It also was discontinued in 1971 (obviously a bad year for electric modellers).
One electric loco i did know about (and once owned) was Hornby's Class 86 model. I remember the fiasco the first time my excited teenage self got the new loco running, i forgot the pantograph was raised and took out my layout's bridge!