I paid 32 euro's over here in The Netherlands, so that would be somewhere around 26 pound.
My Fiesta has PDC at the front and the auto start/stop system, so there where already 2 buttons in my car.
The loom/connector should have 7 wires.
I guess you have a credit card holder over there, with a dashboard removal tool or small screwdriver you can push it out. It clicks on both sides behind the dashboard panel.
But than again, my abs pump/bcm/pcm doesn't recognize the switch. I don't know how to solve this problem. If you have more luck, please let me know
Maybe someone has a wiring diagram, or pin-out of the ABS pump. That would really help.