adrian
Flying Squad
I thought it was Gill Sans typeface*, which seems to be the consensus here BR(W) Steam Loco Livery 1948-64 and from John Isherwood Font/typefaces used by LMS, SR and GWR - Modelling Questions, Help and TipsActually does any one know the font for steam engine number plates by chance.
As John indicates there are various flavours of Gill Sans typeface, he created his own medium weight for his transfers
Mac OSX include a Gill Sans typeface - which apparently is the monotype version.
Which cut of Gill Sans is it that is included on a Mac?
This is what I get using regular and semibold weights
For a little light(!) background reading on Gill Sans for typeface enthusiasts
Typotheque: Eric Gill got it wrong; a re-evaluation of Gill Sans by Ben Archer
*n.b. to be pedantic (and I hope I'm correct!!) the style of the letters and numbers are a typeface not a font, the font is a specific implementation of the typeface, point size, spacing etc.