Just in case anyone didn't know.

If like me, you have a pre-facelift ST and only have one Remote Key, plus a master key, it is relatively cheap to get a second Remote Key, without paying almost £100.00 from Ford.

Buy a genuine Remote Key from EBay for between £25 - £30. Then take it to a key cutting place, such as Timpson’s, who will charge £5, and then best off all, all of the programming for the Radio Frequency & Immobiliser, can be done from the ignition of the car, and takes two minutes (Ford charge £40 for this).

It cost me £25 for the Key, £2 P&P, and £5 for Key cutting. So £32 for a brand new, genuine spare Remote Key. Bargain.