Have you been reading my mind Nutloose? As a jock I am utterly against our "parliament" as it is just another expensive layer of self serving jobsworths trying to look busy so they can claim their expenses.
Simple answer to the West Lothian question is that MPs only vote on matters relevant to the part of the UK they represent e.g. Scottish matter - Scottish MPs vote, Welsh matter, Welsh MPs vote etc.If it affects the whole country, they all vote together, to quote the Mongoose - simples!
As to the Tax disc idea, it might cost a few jobs but it will save a huge amount of money and those who drive more will pay more (sadly that includes me
).