Slick, if you haven't found a solution, take at look at http://www.car-dvr.co.uk/ They have a few makes of cams on offer.
I have 3 vicovation cams, a marcus 2 and 4 plus an opia 2. They all have smart parking mode when hard wired with a permanent feed.
The marcus 2 and 4 have motion sensors, they are always recording but only save to memory when the motion or shock sensors are activated. The Opia 2 does this but also records an image every second when in parking mode and creates a mov file or still image. There is no delay in recording with any of the vico cams. The vico mf3 has no smart parking so avoid that one.
The image quality is excellent from all the cams, the opia2 is recognised as the best on the market but they aint cheap + you will need a battery montior for a live feed, which is another £50 on top of the cam. None of them have gps unless you buy the vico dongle, I haven't bothered with gps.
I now wouldn't drive or park without the cams in my cars, there are so many idiots on the roads I just feel safer having the footage to prove my innocence in the event of some elses foolishness or have evidence to prosecute for damage when parked.
