Kieron - first observation - you are an older git than me. But no shame in that, I wish I'd been born a few years earlier!
Second is, just dis-intered a book from loft - G-ASHG appears to be BAC's prototype 1-11, c/n 4. FF 29/8/63 -eh? also says 20th Aug? - W/O Chicklade 22/10/63. Presumably the Mike Lithgow deep stall accident?
March '64, c/n 6 G-ASJB w/o Wisley. No details in my book (spotters production list), could this be the Lithgow prang?
Details please oh my knowledgeable brethren...