Regarding insurance, the policy is agreed value and 3k miles. Previous owner paid a very similar premium with another insurer so I don't see why it needs to be more.
On the erratic idle. I've managed to drive the car in various conditions and so far it hasn't improved. The problem is only at tickover revs, in all other conditions it pulls cleanly. I can't get it looked at until next week and as the valve is only £20 I've ordered one and will start from there.
