The two Gannet loss, I was at Linton-on-Ouse at the time. We heard about it and sobered up (temperamentally, that is, being young and convinced we were immortal) for a while. I'd always understood it was during night formation, I don't have any other info.
Kew has a copy of the BoE report, sadly not dowloadable:
Board of Enquiry into aircraft accident involving Gannet AEW Mk 3s XL 499 and XP 197 on... | The National Archives