Wee bit of progress tonight, although it was a messy business!!
Got the Saltire Blue painted on, my first time spraying with enamel (this colour was only available in enamel) and first time using the airbrush in quite a few months. Needless to say it got a bit fraught, but it hasn't come out too bad in the end. The finish is a little spotted looking, although I think that may be in part to do with how course the Halford's primer is. It's great for providing a base layer, but it can be a bit gritty, perhaps I should have gave it a rub with some fine wet and dry before putting on the blue... no matter, we'll see how it goes from here. A few coats of gloss varnish should hopefully smooth it all out before I get onto the decals.
The blue itself is very dark, and has quite a purple tinge to it. However, comparing it to photos of the real thing, the Dapol Class 68 and the little Oxford Rail Scotrail Transit van, I can confirm that it's pretty much spot on. The Light blue and white spots do quite a job of hiding how dark the base colour really is. I did however forget to spray the doors first, which are supposed to be some form of silver. However, again looking at photos and the same colour scheme on the EMUs I regularly travel on, it's more a light grey than a silver. I have some Tamiya Sky grey which I used on the underside of a later mark Spitfire, I'll give that a test and see how it goes although I feel it will probably need lightened a bit.
(Apologies for the terrible quality picture!!)