Thanks for the responses.
The car was originally Red, in fact. It was sprayed a variant of lagoon blue in 1986, and if I could identify exactly what blue it was then that's what I'd have. The paint's all off now, so too late to match to. It was different to the standard Lagoon Blue - slightly darker.
I want to get a colour that 'fits' the era of the car, but at the same time, if possible, would like something unusual for a +2 - it's cost enough! The car will not be concourse, as I have already fitted a t9 gearbox and solid rear shafts, and will be having it trimmed with non standard seats etc.
I'd like a metallic blue, with a silvery undertone to it - I think this is referred to as mica.
I originally asked for the Lagoon Blue with the silver roof. We've decided not to go for the silver roof now - at least one decision!
Looking at the pictures in the book by Mike Taylor, the Lagoon Blue +2 in there is gorgeous. If I can find a colour very close to that, but slightly darker, with a bit more depth to it, then I'll be happy.
I've been looking at lots of variants on the web, but keep coming back to the lagoon blue.
I have posted some piccys to the gallery under 'alaric/what colour'. Maybe someone can confirm which is the original standard Lagoon Blue - hard to tell from piccys, but maybe someone knows the car that was at Stoneleigh a couple of years ago - really fantastic example!
All the best.
Sean.