Graham - G3YJR
I had tried a search & got some interesting links on white dry grout!
The uW group link to Charles' website is a dead link. Apparently Plusnet has shut down the site. I can believe this as they have done the same to mine several times.
I can't see a regulator on the top side of the board & the lower side is protected with a soldered-on lid.
I'll search on.
Thanks for the voltage advice Mike.