Paul, how about this one. Only GBP 18.99
BMW Audi Seat VW Bosch ABS Brake Pressure Thrust Sensor 0265005303 8E0907597 | eBay
Pretty cheap.
The output curve shows the output in the 0-5v range so likely the supply is also 5v but i havent found that out for sure yet.
Here is the MKS web page, the sensor is the second bottom one, part number
0265005303.
MKS Autobusiness, special components for special needs - Products