Has anyone ever seen an explanation of the numbering used by Midland General which seemed to a random assortment of a letter followed by a single number i.e. B2 Nottingham-Ripley, F4 Nottingham-Hucknall Beauvale Estate. Was the letter the core reroute and the digit a variation? Thinking of Nottingham there were numerous duplicated route numbers for completely different services as each operator numbered individually without any unified scheme and today two completely different 9's cross Trent Bridge; a NCT service to West Bridgford and a Kinch service to Loughborough. Also it was an example of a regular service between two places frequently throughout the day going different ways when the Clifton Estate services were all numbered in the 60s; for a period the route taken was clear due to the operator with NCT services going via Clifton Bridge and South Notts and West Bridgford ones going via Trent Bridge but became less obvious once the West Bridgford was sold to NCT until the Clifton Bridge services were renumbered into the 40s.