Former British Prime Minister Margaret Thatcher who spent the night in hospital after feeling faint was set to be discharged on Thursday, an official said. Mark Purcell, a spokesman for London's Chelsea and Westminster Hospital, said the former leader was comfortable and feeling rested and was likely to return home later in the morning. "The doctors assessed her this morning and say she is OK," he said. "She will probably go some time this morning. She is very comfortable and very rested." Thatcher, 80, has grown frail in recent years following a series of small strokes and her public appearances have been rare. She has given up most public speaking on her doctors' advice, but is still greatly admired, 15 years after leaving office as Britain's first female prime minister. She was taken to hospital Wednesday afternoon after complaining of feeling faint and remained overnight as a precaution.