"This Agreement is made between Mr E. Edmondson (the employee) and Securicor Guarding Limited (the Company).
"Having heard your appeal and considered all relevant facts, and in the light of your unfortunate poor health, Mr Mills rescinded the original decision to dismiss you for gross misconduct in favour of dismissal on medical grounds. This will be recorded on your file as the reason for your leaving.
"Dismissal on medical grounds, effective from15 May 1997 , will enable the following payments:
"The letter of8 July 1997 recited in the clearest terms that what was changed was the reason for the dismissal not the date."