Will be called back by council to make appointment to get rid of NASTY LITTLE FUCKERS.
£100, since you ask, but I don't want to charge it to the landlord because then he'd have to know about it.
Update: have also ordered humane sonic repeller which should arrive in a few days. Be under no illusions that I am buying this because it is humane. I am buying this because I am told it works quite well. Fuck humane when it comes to bloody cockroaches.