Nearly 30 years has passed since this tragedy and my memory has faded somewhat. I was tasked with RV-ing with Mike and John that night off Flamborough Head. I had the GR1 on my radar and as our closure rate increased we made visual contact with their anti-col light. We had fairly good SA and were in RT contact with them. We suddenly lost visual and never heard from them again despite many attempts to re-establish comms. I cannot remember all the details from the BOI but it was a tragedy upon a mystery at the time. Very sad.