Where can I get a lambda sensor for 1300 tracksport?

[rbolesworth]

Hi there, I've had a lambda sensor go on my SR3 1300 tracksport and radical want £90 odd quid plus vat for a lambda sensor.
As this sounds a bit excessive I was wondering if any of you guys know a cheaper/better solution.
Cheers russell

[RobC]

Has it got a number on it?