Thanks to all for the replies and I will contact Stewart this evening regarding the offer of a coil.
Now back to business.
I have re-welded the frame, re-installed the engine and replaced the fairing, and I am starting from scratch again because I forgot to replace the coil when the engine was out.
I have now reached the point where all I have left of the information supplied by Snaggletooth is a portion of the removal of the air box. What is left of this unit is the outer shell, ie like a box with the top and bottom removed, which I thought would just lift off, but this does not appear to be the case.
Should I just use the sledge hammer method to remove this or is there something hidden which is holding this in place.
Many thanks.