"Martin Rowley" wrote in message
...

"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.

From memory, the end of September last year ... they
managed a whole 6-week overlap!

Philip