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You will not find areas in the 1/1250 Ordnance Survey plans for specific years.This was a completely new survey at this scale in Urban Areas started in 1950. Rural areas were updated at the 1/2500 scale previously found on the County Series plans, and some 1/2500 sheets were produced in town areas by scaling down 1/1250 survey information (no house numbers were shown on these). The OS had a 'Continuous Revision' scheme where updated versions of the 1/1250 sheets could be requested when areas were newly developed or demolition work undertaken. The Statutory Undertakers made extensive use of this survey for their records of pipes, cables etc.and ,I imagine, still do. Because of the random nature of this work, you will find no consistency of year dates, the first 1/1250 plans produced (Sheffield started in 1950) were allocated the letter 'A'. This appears at the bottom left-hand corner of the sheet, subsequent revisions moving to the next letter of the alphabet (eg B...C...D...). Change to Metric heights took place around 1970 and an example of this can be found on this website: https://www.old-maps.co.uk/#/Map/436154/387798/13/100765 Select the OS plan 1963-1970 1/1250. Sheffield City Council had all the relevant Ordnance Survey Licences to reproduce these plans for their Engineers and Architects and Estates Departments. Do they still have a Printing Department? Surely all those 'negative' master-copies are stored somewhere safe in archives. Unfortunately (Sod's Law again) the Sheffield Victoria Station site falls on four different 1/1250 sheets!