Cheers, all.
Yep, the JVC EXAD is only one DIN, although it is SLIGHTLY larger than a standard DIN in terms of height, so the pocket has to be slightly modified to get both to fit. AND it cant use the standard DIN fastener, as it has to protrude from the dash, so that had to be overcome as well with a little jigsaw handywork!
Security wise..... its self releasing, so can remove the screen should I wish if its parked up in a dodgy area (ha ha, that sounds rich coming from someone that lives in Croydon, doesnt it???)
Main passengers are girlfriend, and girlfriend's 7 year old. They both need silencing from time to time. Although Ive found my right foot also quite effective in throwing their head back into the headrest for comical value when they are talking too much!
Andy