The lock was given to me by a friend. It's not a D-lock, but what I thought was a pretty sturdy chain (Marksman, if that means anything to anyone) although after seeing it in it's cut through state perhaps it's more flimsy than it looks.
Really sorry to hear about your loss.
Was this the chain you meant by marksman?
http://www.crazy4bargain.co.uk/marksman-motorcycle-chain-padlock-59038c-heavy-duty-p-758.html?utm_campaign=export_feed&utm_medium=Google+Base&utm_source=googlebase&language=en
@MyQul started
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Really sorry to hear about your loss.
Was this the chain you meant by marksman?
http://www.crazy4bargain.co.uk/marksman-motorcycle-chain-padlock-59038c-heavy-duty-p-758.html?utm_campaign=export_feed&utm_medium=Google+Base&utm_source=googlebase&language=en