"Philip Eden" philipATweatherHYPHENukDOTcom wrote in message
...

Martin, Heathrow's sunshine is now achieved with a KZ sensor, so
you can add something between 5 and 15 to that percentage.

... thanks for that: do you have a record when they switched over? I used
to have a note of same long ago, but can't find it now.

Martin.


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