Hello,
Yes, NCN have split 65 and 1 at this point now in Hull. 1 heads north to Cottingham from this point, with 65 heading into Hull. There's then 66 (I think) heading from the other side of Hull back across to Cottingham.  I added the various off road bits which had been missed on the map, then got in a total mess with the relationships - iD doesn't seem to show me 65, but I could see 1. Any help here would be really appreciated. I have GPS data following 65 (which is essentially right), it's 1 that should be rerouted. All the signs which used to show 65 & 1 into Hull along Hessle road have 1 covered with stickers now.