Unfortunately I have no photo of this spider as I was preoccupied with getting the cat to stop hunting it and then carefully (but rapidly!) getting it out of thehouse... I'm just going to try and describe it. It was about 25 mm in length, and it was entirely grey/light brownish in colour, with a somewhat tubular abdomen. Really quite large overall. It didn't resemble a normal house spider at all, I am just curious to see if anyone has any suggestions as to what this interesting visitor might have been. Sorry for the lack of detail!