[Darren69]

Give it a good clean with degreaser/paraffin and a chain cleaning brush, rinse with paraffin not water and leave it to dry and then have a close look at the O-rings on each link to make sure they're not cracked, split or missing.

Providing you can't pull the links away from the sprocket and its not hooked the sprocket (clicks when you wheel it backwards) you should be ok for a while.

Its probably a good idea to budget for replacement chain and sprockets sometime soon in any case since most peoples idea of chain maintenance is to smother it with chain lube and over tighten it!