Because I'm an idiot and bollocks'd the factory air pressure meter when I removed it from the OEM board of my M15, I had a hunt around and found that it is this - just thought I'd post in case anyone had a similar incident in future.

Manufacturer is NXP
Part number is MPXA4115A6U

http://au.element14.com/nxp/mpxa4115a6u/ic-sensor-pressure-16-7-psi/dp/1457162

Also available here - https://www.digikey.com/products/en?keywords=MPXA4115A6U

Keep in mind this part does not need to be too exact as only 3 pins are used - 0V, +5V and the output. So with the space on the board in this area you could wire in just about any pressure sensor.

The MyECU map also has a configuration line with which you could align to any sensor.