in recent model press [on and off line] there has been 'discussion' over the availbility of signals.
As DWB mentioned, ratio offer a goodly range, in plastic, but they are very fragile.
Hornby offer a basic range, more robust...and I personally 'feel' they are slightly over scale...but the printed arms are a welcome change...if a tad prone to breakage as well.....[do hornby offer spares/]
The concensus as I read it, is that the Hornby items are OK....with the exception of the bracket signals....which are very bulky.....but they do offer the 'basics'.
For prototypically correct signals, then MSE are the folk to see.......and I believe they are quite strong too.
However, I sense 'equipment' correctness isn't your barra......as long as they are stout, simple, and the arms are right?
[a pity Bachmann haven't entered this field? After all, whilst they offer DCC, in reality it is the signals that control the trains?]
However, all isn't [particularly] lost........I suggest you have a bit of fun looking around the used and abused stands...for the old Hornby [Dublo?] signals...they tend to be quite cheap, specially if battered.....and will repaint usefully.
Being made of metal, they are a bit smaller and finer than the current Hornby offerings....I have a few...picked up by scratting through the odds and ends boxes..specially at Deviation shed, NYMR!
cost but a coupla quid or so.....[and I'm happy to pay to support the goings-on at Grosmont!]