Hello, just to let you know that I have a slide of WP213 in the static display at the 1961 Finningley show wearing 207 squadron markings
which is the red lion that you used to see on british farm eggs.
during their service many valiants went out to Butterworth in Australia and your air to air slides may be taken en route. Have a look at 207 sqd sites on the net there's lots of photos that might help you get nearer to sorting the puzzle out
best regards
steve( aircraftsnapper)