Finally repaired the mirror with the old standby Gorilla glue(white).Used parcel tape--cheapest tape to hand--to hold the mirror on while the glue set.My first attempt ended in failure since not enough glue was used it expands to 4 times its volume so getting just enough in the swivel but not to much is the tricky bit.Second attempt was successfull using more glue the joint is strong enough to flex the door mounting bracket when putting pressure on the mirror. Do not use instant glue it will almost certainly run down the door or/and glue up the mirror motor in my experience it goes everywhere. I got the Gorilla glue_in Tesco