There is something wildly luxurious about a day spent walking aimlessly around a city, devoid of a strict cultural or foodie to-do list; when getting lost is the plan. And dotted across the UK and Ireland are towns so pretty that it would be a mistake to go anywhere in a hurry. These are the places, both big and small, where wandering down medieval alleyways, marvelling at sprawling cathedrals or letting grand Georgian crescents transport you to another time should be the most pressing thing on your schedule.