Hi all,
Just for the record, I managed to get an independent ID of the attached from personnel working with the PAS database, where I've since recorded it.
They identified it as a Henry III cut halfpenny, probably a class 5(c?), possibly minted by Gilbert in Canterbury. Date probably c1253-6
Obverse: Kings head facing, probably with sceptre in right hand. HENRICVS REX III around. Note that legend starts immediately above sceptre at about 10 o'clock. N & R in HENRICVS are also ligated (joined together).
Personally, I still can't decipher anything much of the reverse legend but, if correctly identified, should be something like GILBERT ON CANT or similar.
Hope of some help!
Best regards,
James