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@hippy
My workmate wanted a multimeter so I went to Maplins and bought one and then used it to test the solenoid coil.
It has resistance, which, in my limited understanding of basic electronics, means that it's not completely fucked. Which, in turn, means the problem might be in the valve itself. So, citric acid bath for it tonight to see if that makes a difference.
Gaggia store on Oxford st. don't answer their phone so I called head office and I'm waiting for a call back from their service dept. Kev here suggested they are all on a coffee break ;)