After my last post I was just about to go to bed then I heard it scuttling, found it under a settee after a brief skirmish, which involved a chase, I cornered it and stamped on it and that was that. They make a great popping noise.
But... I came down in the morning and my spray had killed two more, they were lying on their backs with legs wiggling in the air, probably been there all night.
Two quick stamps followed by two satisfying pops and that was that.
On another note, just about to go down the west end, looking foward to it, will write a report, tomorrow.