Trevor Smith wrote:

I still have one on my steam iron, I got it years ago from Woolworths an it
appears to be manufactured by WG. I have just Googled but I can't find any
reference to them so they may have ceased trading.

WG in this context[*] is Ward and Goldstone of Manchester who were
Woolies main supplier of electrical items for very many years:
http://museum.woolworths.co.uk/hg-leadinglights.htm
[*] It can also be the German company Wandel & Goltermann.

--
Andy