Thanks all!
I did used to use Alclad RAF High Speed Silver, but Alclads are not in production any more, sadly. The silver in this case is SMS super-silver. These are acrylic lacquers, so they are thinned with normal lacquer thinner (I use the Tamiya stuff). I am very much converted to these SMS paints as they spray beautifully (and are a local Australian brand to boot!).
For the other colours, I did a combination of pre-shading with black along the panel lines, then the base colour, and some selective spraying with the base colour lightened with white. This is the first stage of weathering. Next, after I clear coat and apply decals, I'll do more weathering with some more oversprays and oils... but that's a bit of a ways off yet

I drew up the masks myself and used my Silhouette cutter to cut them out, using a scan of the Airfix decals as a template for the cutting pattern.
Cheers again!
Brad C