Such a case in point is the Hornby R8673 Scaledale Street Lamps. When comparing them with the lamps supplied in whitemetal by 3SMR they are exactly the same height and width.
Even better was the price- Hornby retails at £6+ for four, I paid £1.50 for eight of them.
So it's worth while hunting through those bargain boxes, you never know what you may find!
Unfortunately the link for the new blog, Teignford, was incorrect so it has now been corrected. See Teignford,a 3mm Scale Model Railway
Don't forget Westfest on the 17th September.