I'm going to have to check under the bed now before I get in it! You can get big house spiders in England. They normally come out when it's warm - usually from the rafters or under the floorboards. They can be quite aggressive - I tried to kill one once as a teenager as we had a bit of a big spider problem. I sort of missed due to a feeble attempt at trying to kill it and the spider actually reared up and went for my toes. At which point I let out my infamous 'spider scream' reserved only for those sort of moments. I've often thought of moving to Australia and in five years there I saw 5-6 spiders - I still don't think I could risk it permanently though for that very reason.