I raced on 753 from 1978 thru 1983. First was a Harry Quinn track bike. (see photo's) I knew Harry personally and was a regular at the Walton Rd shop. Harry told me that Raleigh commissioned him to work with 753 as they were having difficulty keeping it together.
Mt other two frames were one track and one road built right in Ilkeston in 1982. The team issue road bike was absolutely the nicest road bike I have ever ridden on. Felt like I was driving a luxury car. One issue with 753 was it's brittleness. My road bike experienced this twice. One time it developed a hairline fracture where the seat stays braze to the seat tube. The other was right at the bottom of the seat tube entering the BB. That's when I decided to hang up the old mare. She is now only for admiring. Performance wise 753 was fantastic. It could handle the any stress and power put to the pedals. ( and yes, I do have similar experience with Columbus, but my favorite it 753)