I don't quite know how to say thank you. I came back from a few days away to find a treasure trove of info. Will need to do some more digging. To answer some of your questions. Margaret Mitchell married my g grandfather George Hurst on 18 march 1879 in the parish of Aughalurcher ,Fermanagh. She died on 11 October 1921 in Belfast . I am certain you have found the right William for me. The entry in 1901 looks intersting although other records suggest Margaret would be 46--but as we dint have her actual birth record 44 could be correct.
I found another address for William on some legal papers . In 1891 he gives an address as 5 Wood Street London and he is listed as a Merchant. Perhaps this was another Business Address.
We had just assumed he was alive in 1909 because of the card from Berry and Co--there is no signature on it--just my g grandmothers writing on the back with the date---Jan 1909---so the parcel could have even been a gift from the comany.
Thank You all for your help. I will start on the trail again.