He was a good friend of my Mum's best friend and I met him a couple of times when he visited our yard in Beautiful Downtown Bermondsey.
On his first visit, and before I knew who he was, he noticed the tarpaulin over DUF and asked what was under it, so I told him it was a bubble car. He immediately laughed and said "I know it's a bubble car, just wondering whether it is a Heinkel or Trojan".
We had a long, friendly and enthusiastic chat about all things mechanical, especially micros and bubbles, and another long chat next time he visited. he was already quite old and I was impressed by his strength and ability to manipulate a large and very heavy trailer in our narrow yard.
I never did get to see his collection or get to know him well, but he seemed to me to be as likable as he was eccentric, a real character. RIP.