In reply to yer maw: Seem to range between £70-£80 (not seen one at £60) and then of course it will cost about £20 to get moggins chipped if they aren't already. My two cats aren't chipped so I'm looking at just over £100. Really don't want a magnetic one as about 90% of folk that I hear about have things stick to their cats collar or the collar/magnet goes missing or the doors themselves aren't strong enough to keep eager cats out.
Yeah, dunno if this one is a stray or not, he/she is in good condition (nice fur, well fed etc) but just looks like a feral cat in its markings. It's fairly friendly though so I doubt it is a feral, like you say just me being a mug and letting it in before now, too soft!