In 1964, the Beagle 218 was redesigned to eliminate most of the plastic,
becoming the the B.242, flying on 24th August of that year.
As before, a single engined derivative, the B.123, was designed.
However the B.242 was later abandoned due to development and stability
problems.
http://www.flightglobal.com/pdfarchive/view/1961/1961%20-%201187.html?search=beagle
http://www.flightglobal.com/pdfarchive/view/1964/1964%20-%202335.html?search=beagle
http://www.flightglobal.com/pdfarchive/view/1970/1970%20-%200806.html
Images below :-
The Beagle B.242 prototype in flight.
The Beagle B242 and B.123.
The caption to the above image.
These latter two from issue 4 of 'Beagle News', 1964, from the Auster Heritage Group site,
http://austerhg.org/index.html
http://austerhg.org/beagle_mags/
cheers,
Robin.