In such cases, it is very likely that the coordinates were added as OS grid references and prefixed with a wrong area code.
I will have a look at them.
EDIT:
I just had a look and noticed that I did correct all of those myself some time ago. The errors were in fact due to a wrong prefix: "SX" instead of "SS".
Edited 1 time(s). Last edit at 09/21/2012 08:24PM by Peter Haas.