Who looks after pest control in owner occupied rental?

Hi all,

I rent one floor of a 3 floor house, the rest of which is occupied by the guy who owns the house. Anyway within a couple of weeks of moving in I noticed all these black little crawly bugs in the room, literally everywhere, and some wicker furniture in my room was absolutely alive with them (i.e. all in my clothes etc). I spoke to the owner about this and he said I could dispose of the wicker furniture, which I did, however the bugs are still everywhere.

I don't know if they are fleas or not, I have had a couple of bites but nothing substantial. I've tried bug sprays etc and am meticulously clean anyway but the problem doesn't seem to be going away.

Can anyone advise who is responsible for dealing with them and paying for a pest control service if it comes to that? The guy I live with says he never saw them before I moved in but I never saw them before I moved in either!

Also if I pay for it to be fumigated do I need permission from the guy I live with?

Thanks in advance.