Markers on top of one another

Ok so this maybe a map question in general

but if you go to

http://www.cotswoldalluredirectory.co.uk

click on “Health” for example

not all of my customers want their full address displayed on the site, however, if you zoom out you will see there is a cluster of 2 markers there, but if you zoom in, you will see that because 2 customers only want their hometown put on the address, the map has put 2 markers exactly onto of one another.

is there anyway to stop this? so that 2 addresses for the same place maybe puts the markets next to one another rather than on top?

some buildings even have multiple businesses at one address, it won’t be great if all the markers fall exactly on top of one another.

Thanks

David