It sounds as if he would rather be in pain than pay for fumigation.
His flat is probably a rental so the landlord should be taking care of the problem.
Spiders Attack - Harry Potter
https://www.youtube.com/watch?v=2JhljqXCGNk
I understand that FReepers often only lazily post a smidgen on an article (less than the 100 words that appear in summations or the 300 words usually allowed, or about 10%) and typically do not read the linked article before raising issues with it, but the answer to your question is plainly provided therein:
Clarion Housing Association which owns the flat...Although the company did arrange to fumigate the hallways and landings in communal areas, Russell said they shunned his pleas to specifically fumigate his home or pay for more intense heat treatment....“He has been correctly advised that under the terms of his tenancy agreement, it is his responsibility to deal with this pest infestation
Meaning the cost of effective more intense heat treatment or fumigation is very expensive, and the Housing Association will not pay for it. Still, a few cans of Hot Shot preceded by DIY BedBug treatments might do it.