Had a good idea today, which makes a change!
I was going to attach the 30 metres of chain on to the existing 35 metres on the main anchor. However, even though it's 8mm chain the 8mm chain connector which you can see on the picture, wouldn't fit through the pipe hole at the front of the deck which leads to the chain locker.
So I've put the 30m of chain into a water drum which will stay in the back locker and can now easly be moved and used with either the main anchor, the kedge anchor (which has 5 metres of chain attached) or the spare, spare anchor.
Simple idea but effective.