Yeah - with their little Mockney accents...
I agree with jason - Leave it be. It is part of where you live now that these creatures will be in and around your living space. There is no need to be skeeved out by it - you need to learn to control that reaction, recting like that to stuff you can do very little about is only going to make your life less pleasant.
If it were something that was going to do harm to your living environment or be a health hazzard then you'd need to do something - but if it is a cricket, frog or gecko (my money's on gecko from your description of the noise) then it's not going to harm you.