I have tried to stay out of this discussion but I would make the point that Janet Anderson's declared second home is in her constituency, not in London. So there is no reason to suggest that Jim Dowd declare this as income, especially since it is payment for a mortgage, not rent paid by Janet to Jim, and therefore it is not Jim's income in any way.
I haven't seen so much nonsense talked on a thread since the witch hunt against Jehovah's Witnesses and our attempts to settle whether or not God exists. I do enjoy such nonsense!