it will i guess be enforced by your local council people
having worked foe councils in the past, we wont have to worry much intill we have to clean windows on the council offices, as they dont venture out much ( apart from a spot of lunch in the pub
)
the cost debate shouldnt come into the discussion, its easy enough to build a system for 500 quid these days ( e.mail me for the DIY link, if you havent seen it ) it doesnt matter if you work out of a car or van, you can build it to suit your circumstances
seriously, this is why the DIY site was started, to let people ( like myself ) who couldnt / wouldnt spend silly money on a "pro built system" , Hell its all componants put together, they are all the same bits, you either let some1 else put them together and pay them for the job, or you do it yourself