I believe that Mr. Newman has answered my question. To confirm my understanding, Section 2 of the proposed Bill, paragraph 57(4), is even more explicit. It says that: “[…] if, in the week in which the election is to be held, the Monday is a holiday, polling day shall be held on the Tuesday of that week […].” That would apply in the case where a general election is not held on a fixed day.
So, in what case would it apply?