They sent me the 'land business change' form too, then I phoned and said my landlady wouldnt give me most of the details cos it wasnt going to be a change of owner. They then said "ah, you need a 7000 number" and sent me a new form, which was like a single page and made far more sense. It is still registered then under the landlady's CPH, which is linked now to my 'landless keeper' 7000 number CPH.
Give them a call again and tell them you're after a 7000 CPH and they'll get the right form out to you
Hope that helps
Suzanne