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How can I fix my Ferroli Optima 901 Central Heating Boiler?

I have a Ferroli Optima 901 C/H boiler and Scottish Hydro have diagnosed a leak from the 'isolation valve'.
Ferroli have advised that another valve from certain other manufacturers. Please advise make and part no. if possible of a compatible make and model of boiler.
Mrs Rosemarie Haughey, March 2009
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