The Spyderco UKPK is designed specially for legal UK EDC, and I've heard a few people have said the police in France had no issues with it either. I can't comment on Italy's laws though.
You could carry any knife you want (apart from the ones on the above list and a couple others [push daggers & knives with a "knuckle duster" handle]), but you need a "good reason", and "just in case" (an EDC knife) isn't a good reason. Hiking, camping, fishing, hunting, gardening, etc. would all be good reasons... but if you're stopped by police in the town centre don't think for one second "I'm off camping in a minute" or "I was just doing some gardening and forgot..." will stand up.
PS. anything carried for self-defense is classed as an offensive weapon. You can use anything at your disposal to defend yourself (with "reasonable force") should the need arise though (get handy with a pen/keys etc. if you're worried).