I had this issue, bought a 65 off a gent in Huddersfield number 130, when I changed owner via the d65 website I expected a new number as the gent told me I'd have to change number as that's his number. The association then said to me to carry on using 130, I then got a MYA number so I'm confused as to what I use. I don't know the Hull number as its a v5.