Even though I have combed that area already (believe me),I acted on your advice and took the detecting stick out for little hunt.
I didn't find another medal but I did find a few other bits.
The finds of note are:-
2 pre decimal pennies
2 threepenny bits
1 silver sixpence
1 silver three pence
1 silver heart charm
1 old 10p
1 bling dog bone
1 silver coloured tag item
1 knackered old pedant
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They say "a field is never empty",the other medal may well just be hiding somewhere.