So, the car went in to Ford on Monday and I collected it back Tuesday (yes, they needed it for two days to diagnose this issue).
I had a glimmer of hope going in, because we'd noticed that prior service dockets had "Contract Name: HARRIER" on them... indicating that the car had an extended mechanical warranty. But, I was informed that the warranty stays in the original owner's name and does not travel with the vehicle
Service report says
Quote:
Connected to IDs computer and found code P0715:2F:28-TCM
Will need to replace input shaft speed sensor as per TSB 14/07
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Quote for repair is
$3427!!! 
and 2 days' work.
Bill of materials is below:
Apparently they subtracted three hours' labour charge for that, but I was still completely shocked - going on the basis of other experiences here, I was expecting a total around $2.5K (still too much). I expressed my view that the sum outlined was well above the odds, and that parts should be gratis anyway as the failed sensor was never fit for purpose, but at the moment this is how it is.
Next steps are to find out if any other garages can offer me a better deal, and try pleading my case to FoMoCo...