Its not unique – there are several like that including PT462 in Wales. The current mod was devised by Dick Melton in conjunction wth Nick Grace and first used on ML407 (although the Soviet Air Force was the first to put the concept in to action in WWII).

Hi all, another reason for using this type of canopy is that the origional bulbus one are as rare as hens teeth. We are doing a T9 at the moment to be fitted with bulbus canopy but it looks like one is going to have to be made from scratch !!! unless some one on here knows where there is one going spare !!!!

Steve