Having taken some advice from fellows at the GS Resources Forum I discovered that you can take the airbox apart. You need to remove the copper rings from the carb to airbox boots, prize out the boots and then you can see the screw heads.
Copper rings coming out.
Remove the boots.
Now you can see the pesky screws that need to come out to take the airbox apart.
Out you come.
And apart she comes.
