I don't want to stir anymore on this subject as some of the posts made me cringe. This isnt a loaded question but is the quoted £6 billion in 'profit' or revenue? I would imagine the dvla department costs a few quid in administration every year.
Alex
The way it usually works is that the Treasury gathers up all of the money from whatever tax/income source it might come from into one big pot, the Government departments then get their annual budget from that pot. Thus, the £6 billion will the the total revenue from VED rather than the total less DVLA's running costs.
As regards whether anyone will take any notice, they certainly won't if people don't put forward their views. The address to email is at the end of the link I posted earlier. If people can't be arsed, don't but you can't then moan that the final system doesn't meet your needs.