Thanks Ian, that's one way of putting it!!
Done a little bit more. I re-painted the green, as I wasn't happy with the tone of the first attempt with the currently unpredictable Humbrol enamel. As I wanted a hard-edged demarcation, I decided to brush-paint it freehand.
After doing a little light panel-line work, the model was sprayed with a couple of thin coats of gloss clear, using Johnson's 'Klear' (Future). This was more to protect the paint-work from grease and scratches, whilst the rest of the painting is carried out; it'll get a couple of more coats before decalling, and then a final one or two coats as a finish.
Once the 'Klear' had fully dried, the area for the Squadron markings, surrounding the fuselage roundels, was masked, ready for hand-painting. In order to get the proportions right on the Squadron flash, an 'arrowhead' shape in white, with a thin blue outline, I used a circular adhesive label, the same size as the RAF roundel, to mark the position of the roundel, then used the halves of another label to create the curve of the inner edges of the 'arrowhead'. The rest of the masking was done using Tamiya masking tape, then the required area painted in matt white. Once this is dry, it will be given a thin coat of 'Klear', again to protect it, then more tape masking will be added, and the thin blue cheat-line painted in.
And then, it's time to apply the massive amount of decals! I'm still undecided whether to make a decal for the squadron badge on the nose, or hand-paint it, but that's a problem that can be solved nearer the time, many hours work from now!
Thanks again for your interest and kind comments.