The tallest peak in Gloucestershire (and the Thames valley) is Cleeve Hill at an enormous 1,083 feet (330m)!
Whilst that may not test too many lists of highest mountains (even in the UK) it does provide some wonderful views over Cheltenham and its racecourse, over the River Severn and into Wales; and to the north over Winchcombe.
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Panasonic Lumix G9 + Leica 8-18mm + 3 Legged Thing Punks Rick