There is, as far as I'm aware, no supplier of gantry-mounted signals. All the UK suppliers (Berco/Eckon, Traintronics and another whose name I can't recall) all make 'stand-alone' signals - it is possible to use the heads from these fitted to a suitable gantry, but it is a 'DIY' job. Best bet, if you can get hold of them, is to use Eckon kits. Unfortunately the makers (CCH Models, 22 Nansen Road Holland-on-Sea, Essex, CO15 5EE, tel 01255 814639) do not have a web-site. But you might try www.gaugemaster.com who are the trade distributors and also retail the units themselves.
PS If you look at the top of this section of the forum you'll see we have a sub-forum for 'Signalling' to try and keep all the signalling threads together. You might find a couple of the replies in Signal Gantry of use to you.
Suggestion, assuming "00" ....
Dapol signal gantry kit (C017 - Signal Gantry)
Number, as needed, of Eckon two, three or four aspect LED signal heads supplied with extra long leads. Contact CCH who are often more than pleased to supply heads with longer leads to order (at a cost!)
Problem solved perhaps
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