Dimitris have you seen this?....
BuddyMappingAs you are the Arillas website owner you would create an account, then all us members can choose to submit our location. The map would have lots of markers for the U.K, but luckily there is a scroll down menu at the side of the map showing members details and avatar.
It is used on another forum I'm a member of, it's quite interesting and nice to actually see where other members live.
Eileenxxx