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Below is a link to the standard for UK signals:

http://www.rgsonline.co.uk/docushare/dsweb...399/Rt0031a.pdf

Diagram on page 7 shows lenses to be 200mm diameter (8" approx) and at 255mm centres (10" approx). I also measured one (undefined provenance but presumably elderly) at Crewe Heritage Centre which was about the same as this. So although some older ones could be smaller I suggest Richard's 3mm LEDs are about right for modern UK signals in 4mm scale.
 
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