Fantastic, thanks Jason that works a treat. It's always something that is staring you in the face.....
The software works really well and has added another dimension to my website. Only other issue I had was it not coping too well with large volumes of data in a recordset and hence my moving to a regionalised map. The xml cache has remained blank no matter what I try so could be back when the number of venues on the site increases.
Will build in a workaround for the blank recordset.