A couple of years ago I bought a couple of working colour light signals. They were supposedly N gauge (my layout at the time was N) but looked a bit chunky. To be honest they don't look far off the right size for the HOe Birches Green layout. However I have decided not to use them as they look a bit... well cheap.
I've bought this kit for a number of dummy signals. Hopefully i'll be able to build them and install them around the layout over the coming weeks.