ok no replies but thought I would update just in case anyone is interested or has the same problem. Router went from bad to worse, losing connection completely, adsl light flashing etc. Forgot to mention that when I first set it up there was a high pitched noise coming from it, barely audible normally but noticeable when the room is silent. Phoned D-Link and technician confirmed that the router is faulty. Took it back to Currys and they replaced it with a Belkin model of same price. Set up so much easier on the Belkin and now speeds are back to normal.