This is a relatively old thread but I’ll make a comment anyway. The Immigration Act 2014 imposes new obligations on landlords. How much these need concern AirBnB hosts remains to be seen. Also, given that only specially-trained Register Office clerks are allowed to approve marriage applications conditional on visa checks, I wonder how landlords can be expected to:
That said, when I first came to Britain as a diplomat I stayed in temporary housing (AirBnB didn’t exist, indeed the Internet didn’t exist; I got a list from somewhere). We stayed there a month or so; I’m sure my Embassy gave that address to the Foreign Office (if they gave any).
But to open a bank account one normally needs not only a passport (and proper visa status, the Immigration Act again) but a utility bill or council tax bill, etc. To get a National Insurance number one needs a contract of employment, and only certain Jobcentre Plus offices can handle applications from foreigners https://www.gov.uk/apply-national-insurance-number
I recall that when my son-in-law first came to Britain from France, speaking little English, my daughter wasn’t allowed into the interview room to interpret for him. And that when my son and about-to-be daughter-in-law went to the Chelsea Register Office to get a marriage licence they were interviewed separately.
In both cases, temporary addresses were the least of the problem. They stayed in one of our rental flats. Various tenants still get post at our flats. So long as I have a forwarding address (these are mostly people who stayed until they found permanent housing) I’m happy to forward post. In one case a tenant moved to Dubai and continued to get post from a bank and from HMRC for a while. For a while I sent him the post but when I detected HMRC sending warning letters I wrote them, sent the unopened letter back, and explained he’d left the country permanent and moved to Dubai. (I knew the guy well, he’d rented a place from me for a year and hardly ever used it; I knew he’d paid a lawyer £10k to regularise his business visa. But in the end moved to Dubai to make (much) more money.
Yes they ought to pay the Post Office for mail redirection. But my tenants seem never to do that.