Slopilly:
Double x = Double.Parse(p.Substring(0, p.IndexOf(",")), System.Globalization.CultureInfo.InvariantCulture);
Double y = Double.Parse(p.Substring(p.IndexOf(",") + 1), System.Globalization.CultureInfo.InvariantCulture);
p looks like this:
"-2.716592,52.056538"
Incidentally I've noticed that the app sometimes gets cached somwhere along the line - the latest version just has a single, labled slider on the map page if that helps?