Possible inspirations for Gal Dove
Here are some real life gangsters who Gal Dove could have been modeled after:
Ronnie Knight
Kenneth Noye
Patsy Adams
Mad Micky McAvoy
Mickey Green
These men were once British mobsters who fled England and moved to Spain. It's possible that Gal was a combination of some or all of them. Who do I think he is? Not sure, but if I was guessing i'd say Ronnie Knight. The others are well known and don't seem to fit the profile as closely. But knowing how much attention the Costa Mob has received, Gal Dove may very well have been the product of a imaginitative script writer rather than a characture of a exiled gangster.