Which Dashcam for your 124

[thinkman]

Just looking at options, Blackvue I was looking at but rear view is the difficulty

[jonscz]

I have this one in my 124
http://www.halfords.com/technology/dash-cams/dash-cams/blackvue-dr650s-1ch-dash-cam
It is only front facing, but it hides really well behind the mirror and it's easy to completely hide the cable running down to the 12v power socket under the dash.
I have had another one of the same model in my works car for 18 months and it has been faultless. Really easy to use app (although it does buffer for a little while for playback). Superb build quality - totally recommended.
Not sure about the '2 cam' setup - (eg this one http://www.halfords.com/technology/dash-cams/dash-cams/blackvue-dr650s-2ch-dash-cam ) as like you say, there isn't any way of mounting the rear facing one.
I am not bothered about stuff happening behind me, though.....
Cheers, Jon