I'm coming to this thread a little late as I've only just discovered that these forums exist!
John Roberts was my father ... He died when I was 2 and a half. My sister only 6 weeks. The 2 Downey girls were 2 and 4 I think.
We were all very lucky this year to go to Wettenhall for a memorial service to remember them both. We couldn't have been made to feel more welcome by the local residents .. Many of whom remember (and will never forget) that day. A plaque has been erected in the church
I'd love to hear any stories you have about John ...or indeed details of the crash.