Hi HP - the replacement has clips on the back rather then a bolt so I assume the one in place does too. The thin string, fishing line might be a good one to try and slide through the back - I shall give that a go.
Thanks!
Badge sorted plus I added something extra....
The string trick worked a treat as long as you use quite thin but strong string. It loosened the glue enough to get fingers underneath and pull it off... Oooeeerrr