I think that every time a BBC programme lets a guest refer to asylum seekers as illegal immigrants it is important that it is fact checked. It's very clear and covered by echr what a asylum seeker is and their rights. It's not a matter of opinion. It is fact. Of course the interview guests are biased. BUT Its is the job of the BBC to 'inform, educate and entertain.
The difference between an asylum seeker, a refugee and a illegal immigrant is very clear.