“In the present case the appellant had neither sixty days nor a reasonable period to find an alternative course by the date of decision. We were told at the hearing that the practical problem which appellants are faced with when seeking further leave to remain under the points based scheme when they were previously granted leave to remain under the student rules is that they have difficulty in persuading colleges to offer them places as there is concern about whether they have extant leave to remain, colleges not being aware that appellants in these circumstances have leave under section 3C.”