So here it is, according to the "World of Trains" part set that I spent my pocket money on in the early-mid 90s, this is the design which came second (sort of) to the eventually chosen class 60.
I like it more than what they did build, though I like that too...
"World of Trains" was money well spent, as well - it's what made me realise that there's an awful lot of interesting railway beyond the shores of the British isles; South America and Africa in particularly have some fantastic systems (I love me a Kenyan Garrett)