A word about life extension to RAF escape system explosives, not necessarily related to non RAF aircraft. Extension of installed life was a fairly common event as I remember. Provided a justifiable operational reason was given, an extension of installed life could be granted up to the limit agreed by the OEM, but never to exceed the storage life. Of course things may have changed by now.
Regarding ex RAF aircraft, I was once asked, asked! after a lot of 1* name dropping, it was almost demanded of me to provide a copy of the OEM authority to extend a set of AAES explosives installed in an ex military jet, otherwise I would be responsible for that ac not completing the display season.
Having demurred on this I suggested the retired RAF officer contact the OEM. The full story could almost fit the 'Deference to Senior Officers' thread.
A bit off thread, but does anyone remember an unarmed seat falling out of an inverted JP (I think) over Suffolk late 80s early 90s?