Spare part Diverter valve

Hello,

Does anyone know where I can get a Glenhill boiler spare part diverter valve GT 901?

I have got the following boiler:

Serial Number: 3199100104
Date of manufactur: 7.06.2007
Appliance tpe: Gas fired condensing combination boiler
Stockcode: AGB 5035
Model name: Gledhill HE Combi
Model qualifier: GB35C
Model ID No.:GL No. 47-317-01

Or is there a similar new boiler to the above.

Thanks....