(26 Jul 2015, 3:22 pm)S813 FVK wrote Wasn't the X66 already an Arial number? With you saying 'excluding', i assume the X is a different font (the closest i can find is 'Arial Narrow Bold Italic' with the lines going above and below the route number manually drawn on)?
I don't think Arial was used previously on the X66 destinations - compare the two route numbers below:
Go North East: 4975 / NK53 UOB by Marcus (Green), on Flickr
Go North East: 5392 / NK15EMX by Daniel Graham, on FlickrI can't remember which font was used, but it certainly doesn't appear to be Arial. The 'X' is now completely drawn manually, with the '66' in Arial Bold Italics.