There's another French 'polar' as they call police/detective series in France, which I think the BBC could take in, which I've seen on TV5monde europe, 'Central Nuit' the final series of which they're screening next week prior to showing the feature length film to bring the series to a complete end. I thought it was quite realistic.
As usual, with so many French releases, the French DVDs don't have English subtitles. I saw an ad in today's Independent for a film called 'Polisse' which looks promising (it has Karole Rocher from Braquo!) to be released to cinemas on Friday. The DVD came out in France earlier in the year. Hopefully we'll see it in a few months.