According to section 54 of the Constitution, and the Standing Orders, the House of Commons cannot adopt a bill that requires a royal recommendation, but it may debate it. During the process the Speaker will be called upon to rule on a bill if there's an argument, a point of order, to the effect that there might be a need for royal recommendation. Even when there is a ruling, the bill could continue through the process until the question is put at third reading.
There's always a possibility that the bill will receive royal recommendation during the process, as happened a month or so ago with one bill.