Over the past few years I've migrated to Peter S Taylor: 01273 820303 for my classic insurance.
I have several classics on one policy and have the ability to add or remove more (as I do frequently) for a tenner a time. Obviously more premium to add if the car is (much) higher value.
Restricted to 3k miles, and not having to be garaged, I pay approx £105 for either a V8 or standard TR7 fully comprehensive for a year. From memory I think the agreed value for one was about £2.5k and the other £1.5k - didn't affect premium.
I think pre 1980 also positively affects the premium. I have one 1960s classic covered for £20k for £130 ish, but a 1980s one for £10k that costs £165 ish.
Easy to deal with - no call centre!
Please mention me - I'm going for an advertising discount with them next year!!!!! [:D]
Shaun