Thanks Kevin!
I got some more done last night, and the first coat of paint has been applied.
The gun blisters, bomb doors and small, oval, rear fuselage windows have been fitted, and the model cleaned and polished, and then masked. I decided to fit the cockpit and gunner's canopies later, so these areas, along with the nose glazing and the nose hatch, were masked with Tamiya masking tape (the framework on the nose transparency will be painted later). The oval windows and the reccesses for the underwing landing lamps were masked with Humbrol 'Maskol' liquid mask, and the wheel wells and engines packed with damp tissue. Kitchen foil was used to wrap the landing gear legs. Holes have been drilled ready to accept a few scratch-built bits and pieces such as steps, aerial wires, beacons etc.
I had intended to use Humbrol matt enamel 'Sky', with the addition of a touch of yellow, as the current version is a little too blue for the period being modelled. However, when I opened the tin, I found the paint had gone solid, even though it was only purchased about two months ago, and only used once!
So, I found a 20 year old tin of Xtracolor 'RAF Sky' gloss enamel, last used around 1992, and checked it out. It stirred well, and thinned easily, using white spirit. I've only ever used Xtracolor enamels for brush painting until now, but I have to say that it sprayed beautifully, giving a smooth, even, gloss coat, perfect for decals - not that there'll be any on the underside.
Unfortunately, I can only obtain Xtracolor paints by mail order, so I'll have to use the Humbrol matt enamels for the rest of the paintwork. But I have a feeling I'll be stocking-up on Xtracolor paints in the future!
The pics show the paint, the masking and the model so far, and I'll get some more pics posted soon.
Thanks once again for your support and interest.