The BBC's latest attempt to minimise the effects of immigration on the UK

BBC Radio 5 live had a piece on rented accommodation this morning, just after 07:30. 

Factors in rising rents that could be mentioned were rapacious landlords and too low a level of building new homes (low supply).

Oddly an important factor behind increased demand, immigration, was not mentioned.

Do the BBC not consider demand to be as economically important as supply?

Do the BBC have an unwritten policy that the negative impacts of mass immigration must not be mentioned if at all possible?