Some info here on Dentons
https://www.retrobike.co.uk/threads/denton-mercian-built-1959-fr-no-59279.347550/
https://www.retrobike.co.uk/threads/denton-mercian-built-1959-fr-no-59279.347550/
Neil is on here and is the man behind the SBDU site linked to above. Hopefully, he will join in at some point.The site owner is called Neil Mcgowan, last time I spoke to him he was running https://www.recyke.bike/ in Newcastle you could maybe email him there and see if he has plans to re launch his site.
Some info here on Dentons
https://www.retrobike.co.uk/threads/denton-mercian-built-1959-fr-no-59279.347550/