EBC didn't always have that rad, happenin' punk 'tude thing going on, though, innit. Before the rebranding in 2001 the image was a little more reserved: respectable greens and greys, more urbane than urban, although there was a nice experiment in self-deprecation in the mid-90s. I blame the modern look on the invention of baggy 3/4s, myself. ;-)
Shouldn't there be a series of posters, rather than just the one? Copenhagenizing it could appeal to a less fraught mindset; knobbly tyres, hills and hyper power lights for the gnarly contingent; roadies need their black pointy bicycles and lycra - as long as they use their plastic bikes for commuting to work half the time.
My employer began a cycle to work scheme this year, and from what I've seen, the demographic for applicants is pretty wide, notwithstanding the price limit. There are people riding folding bikes, commuter bikes, mtbs and road bikes, possibly with a tendency towards the commuting machine (I don't have the facts and figures).
But certainly no deviant bikes. Heh. That would put people right off the idea.