I can point you to place in America where you can import it from $43 plus $35 shipping to UK. You would then pick up another £10 customs fees or so.
I hope it was for the non turbo one as I'm sure it was black, the turbo ones are grey.
If anyone else finds this thread and are looking for a
T5 fuel pressure sensor (turbo, grey one!), here is the list of parts you can use as Volvo part number: 31272732
Standard: FPS18
Borg-Warner: FPS518
L/Rover: PR4291
Bosch: 0261230239
Volvo: 31272732
Airtex: 5G1520
Ford: 1582665 £54 -
LINKY!
The list of part above is for T5 Turbo and NOT the 2.4i - Just so people are 100% clear as you will ruin your fuel pump with the incorrect one on a 2.4i.