I had already tried various re-typings and usually found the toolbar make-a-link greyed out.
Eventually managed with one of the names to drag it out of the table, remove its new cell border. On clicking the link found a form requiring me to enter the mailto: address. When I did this and clicked in the document it gave a dismissive 'cant open file, error...OK!
There was a clue somewhere about starting the address with http:// I did that and Word eventually gave me what I wanted.
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