I don't think that David would have driven a van. At least not when I was there because he was a salesman at the time, so he probably had a company car. He was very tall and thin. Bob Kirkham used to call him "our skeleton staff".
Yes, Vulcan Works was off Pollard St. That was where my mum first started work. A while after, the old man "told" her that from next Monday she would be his new secretary at Sackville St. I had just left a job and they, apparently, needed someone on the switchboard at Sackville St too. When Barry found out I was unemployed, he told mum to "bring her in, she can start tomorrow". Easiest job I ever got!!
No, we weren't there before 1970. It was 1972, I think, when we started.
I am surprised at what you mentioned about Martin, as I had heard something quite different. Are you sure about this? I really hope that you are.
Oh yes, they were indeed happy days!!