Hi thanks for your mail. I'm aware of John St which was demolished when Corporation St was formed but was it known as St John St in the 1770s?
I came across this record listed in The Birmingham Directory: or Merchant & Tradesman's Useful Companion, Birmingham. Printed & Sold by Pearson & Rollason: John Clarke - 13 St. John's Street, Birmingham, Warwickshire, 1777 - 1781.
From 1810 to 1828 his descendant was Joseph Clarke Victualler at the Lamb & Flag, 12 John St, (Old John St, on some records), so was John St also known as St John St?
Joseph's nephew Richard Clarke was the Borough Surveyor responsible for the development of Corporation St.
Thanks for your help.
Colin Clarke