Hi,
If it’s of interest I’ve uploaded a scan of the Radio Constructor article from 1956 describing the Mullard 3-3.
You’ll notice there are subtle differences between the circuits in the Mullard publications and the Radio Constructor. The differences are in the EF86 anode load and the screen grid supply.
The Mullard circuit can be found here:
http://www.r-type.org/static/3-3.htm
Terry.