I have been looking to buy a signpost light.. I tried looking up Forest City..I've no reason to think they are no longer active. I've just typed in "forest city altrincham" on google and their website - "Forest City Signs" is at the top of the results.
Apologies for mucking you around. I was a little too eager to hit the "submit" button. Just goes to show you shouldn't always believe what you (or rather I) unearth online!
Having had another look, I do now get an uneasy feeling that things are not quite what they seem. The old Forest City would appear to be no more, although its products such as the sign lighting units do seem to live on under a new guardianship.
Further research seems to indicate that Forest City Signs of Altrincham became part of "Signature Ltd - (Traffic - Lighting - Transmission) back in 2001. Presumably through acquisition and expansion, the group seems to be involved in the manufacture of pretty much everything found on the UK streetscene.
The fluorescent sign lights still seem to be in production albeit with the LED option, although I would have thought that nothing other than a vintage FCS product would do for a streetlighting enthusiast.