OK. Just for the record, I eventually found it.
If anyone else is interested, the VSS sensor is connected to the gearbox, behind the gear linkages, and only just accessable.
It has a snap plug with 3 wires.... Black/red, black/orange and purple.
The purple wire is the VSS wire.
I've included a diagram, It's listed at component number 10, but to be honest, it's a little further round the back than indicated on this pic
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