William,
thank you for the suggestion and the link. I had found similar products on eBay. The problem is there is a 5″ open gap to span(excluding the fixing points. and the catches I’ve seen have a span of 4″ and including the fixing points. I have looked at some USA forums and it would seem the hasp and staple are strong and lengths are such that the gap can be coverd and secured by a padlock or a simple clasp. I shall probably go this way unless something more suitable pops up.
Eric