Council Tax (New Valuation Lists for England) Bill

I am afraid that my hon. Friend is not making much headway with me, because I have reached the conclusion that his drafting is defective. The amendment refers to"““a group of adjoining billing authorities””." Why must they be adjoining? Would not a better phrase have been ““a group of comparable billing authorities””? City centre property values may well rise and a view may be taken that urban authorities, not county authorities, should carry out a revaluation, yet under his wording, they would have to be adjoining billing authorities, not comparable ones.