Round us, they do home visits / spot checks. A flat for rent v close to an over-subscribed school has almost certainly been used several times before for the same purpose, and the address begins to look familiar, I think.
If people genuinely move house and live next to a school they then have a continued relationship with the whole local community.
However, there is a v 'desired' school v close to us, where people routinely rent neighbouring flats for a while, and then move back to their house in a posher part of the area. The effects of this are that:
They then 'bags' the sibling places in subsequent years
They 'free-up' the flat for the next years intakes of applicants, who then stay until place is secure, ensure THEY have sibling places, move out...and so it goes on. If people genuinely move house, at least the neighbouring property stays in the hands of one family, and only one set of siblings!
The car parking situation is terrible because they all drive in from their posher area.
People who WOULD have been in the natural catchment area are squeezed out, because of the v high number of sibling places taken up.
Personally, I think it stinks. But if you don't rent that flat, someone else wanting to be part of this proces almost certainly will, so your choice.