Enjoyed reading your post Cyclo. Great stuff about Harris. Although I had never heard of a frame bearing his name I had of course heard lots about Harris. I saw him at Ibrox Stadium in 1950 when he was part of a group of European track riders who were touring the major cities in the U.K. I enjoyed the afternoon thoroughly, but there weren't many spectators. Johnny McKenzie, Douglas, had beaten Harris in a race a couple of years before, but he didn't do it the day I was there. The excerpts from his autobiography shown on the site you posted are very interesting. Imagine him coming back in his fifties to win the British Sprint Championship again! Says in the article he won the World Sprint Championship too, but I don't recall this. The article didn't mention that he'd been badly wounded in a tank in North Africa and discharged as medically unfit... hard to imagine that too!
The third site you posted, the one about Cogent Bicycle building in Wolverhampton, is also very interesting. I guess this explains why this city became a centre for bicycle building well into the post-Cogent century. I'm thinking of Percy Stallard and the fine bikes he turned out. I wrote to him in 1949 looking for one of his bikes he advertised in the Cycling for £9-15/-, but I backed off at the last minute and had Niel McCulloch, Govan, build me one instead...for £13: £5 down, 10/- a week!