This is normally possible as long as the lending library is in agreement, has not recalled it or the item is no more than 3 days overdue. You should wait until a few days before the due date before requesting a renewal, you can request a renewal via library help, or via the telephone (+44 (0) 191 208 7662). Alternatively, you can do this in person at the library your borrowed the book from, either the Philip Robinson Library or the Walton Library.