On Wed, 26 Feb 2014 17:32:40 +0000 (GMT), Dave Plowman (News) wrote:

The transformer primary has two winding wired in parallel which seem to
be coil 1 black start brown end, coil 2 red start orange end.

Red and black are paralleled as are brown and orange. Red/Black goes to
neutral, brown/orange to the off/on switch.

So it looks like I may be lucky and simply altering them to series will
do it for 240v. Link brown and red and 240 goes between black to orange?

Draws a picture to make sure, yes that is correct. B-)

Does it matter if one winding has the connections reversed when they are
in series?

Yes the fields generated will cancel and it won't work. It may also
get rather hot and go bang.

Check the size of the smoothing capacitors, IIRC they don't need to
be quite as big at 60 Hz as 50 Hz. Not critical unless this thing is
going to be driven hard, which may cause the supply to have rather
more ripple than intended.

--
Cheers
Dave.