Thanks to all
Tight Scot:
I have tried all your suggestions - unfortunately all changes have resulted in no change.
Pabscars:
I have used other devices and it still does not appear.
Dai Nasty:
Net stumbler does not find the network (assuming you just run the scan function)
The routers I have used are:
1. linksys wrt54gs
2.Belkin G Wireless Router (
http://catalog.belkin.com/IWCatProdu...uct_Id=461137#)
Just to note these are cable routers for virgin media
p.s. no energy saving light bulbs