I like this. Looks secure. Could put dome headed bolts on outside so can't undo them
http://item.mobileweb.ebay.co.uk/vie...id=75728095352

Any other ideas like this. Found some hasp and staples as well but the keep was only small so would need a bigger one welded up

Got this on them at monent which is rubbish.
http://item.mobileweb.ebay.co.uk/vie...id=17089777296