Keele have been pretty lenient in the past, but I don't know how it will be this year. Last year more people than expected met their offers, which caused pressure on accommodation etc, meaning a higher number of students than usual were given temporary shared rooms.
If a similar thing happens this year, they may not be able to be as lenient as usual, but if you only miss your offer by one grade and they like you, chances are you will still be accepted. It might be worth contacting the university now to ask if they can tell you if you would still be considered or not.