Your paint does look like Light Stone to me Paul, but I don't think the original was Light Stone anyway, more like Camouflage Desert Sand BSC381C 380.
See Ted's pictures on the end of this thread.
http://hmvf.co.uk/forumvb/showthread.php?40229-Salisbury-Plain-Camouflage-Scheme&p=381536#post381536
PS If you don't want to waste your Light Stone, I've found a touch of red oxide would beige it up a bit.