This stamp, SG534, was one of a set of four issued for the Coronation in June 1953. My Stanley Gibbons 2009 catalogue gives a value of £75.00 for a first day cover (with the set of four stamps), actual value somewhat less no doubt. Yours probably less still, maybe £10. The postmark seems to have worked though.
The slogan cancellation was used over a period of time. Your cover isn't a FDC. A full set of stamps on a similar cover as yours would cost around 5 uk pounds. A single value might be worth around 1 uk pound with the cancellation.
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