Had no idea that was the way to do it.
Are you usually so belligerent?, or are you having a bad day?
I think that's me finished here - but to the OP, genuine thanks
Bye
Just wanted to say thank you to the originator of this thread
http://www.diynot.com/forums/viewtopic.php?t=197299
A simple photo has helped me sort out my own boiler - which broke down tonight, just as the family needed showers.
I know that it's sometimes an effort to upload a photo...