trev it's the same where I live - Bournemouth Borough Council covers the constituencies of Bournemouth East and Bournemouth West, and while Tobias Ellwood (east) may lobby the local council for something which affects constituents in the west, it will also affect his constituents, so any unpopular policies could see him voted out at the next local election.
Similarly in Westminster my MP may vote on something which would affect you, but it would also affect me, so for example if he were to vote on a massive hike in prescription charges, no you wouldn't like it, but neither would I, which still affects his chances of re-election.
The issue with a separate Scottish parliament is that issues affecting you and I are voted on by Scottish MPs who come down to decide that we should pay for prescriptions and tuition fees while their constituents get them for free.
I agree that there are a lot of clowns trying to sway people either way - Scots who haven't lived there for years and who it wouldn't affect, and Cameron's grovelling is just embarrassing, although apparently Gordon Brown managed to pull a half-decent speech out of the bag at the last minute.
It seems to me the person speaking the most sense is John Redwood.