(23 Aug 2015, 5:47 pm)R852 PRG wrote It would make perfect sense to number a service after the last two digits of the road it takes? In that case let's renumber the 21 as the 67.
Aye, but giving the Newbiggin to Newcastle express a number that isn't common with the X20 wouldn't do either service any favors. X20 / X30 sounds perfect.