Thanks so much, this worked! There was no response when plugging into a charging source but by plugging into the laptop to charge and trying your method above, the message came up that the recover boot driver was not installed. So by applying your method above I ended up being able to reboot the phone, restore factory settings first, then restore from back up. It took some time but it worked. Thanks again, very much appreciated. It was a work issue phone too so you've helped me out no end!
Have a virtual beer on me...