London, Bath, Oxford, Edinburgh

This itinerary is a Harry Potter theme itinerary, and we have included a total of 13 Harry Potter sites all over the UK.
Day 1: Reach London
Day 2: London Bridge, Tower Bridge, Shard, Borough Market and Leadenhall Market, a Harry Potter filming location
Day 3 - Buckingham Palace, River cruise, London Eye, Big Ben, Westminster Abbey
Day 4 : Harry Potter Studio Tour, famous King Cross Station, Piccadilly Circus where Ron, Hermione and Harry dodge the London Bus
Day 5 : Self Guided Day tour to Oxford for Harry Potter locations
Day 6: Leave for Bath and explore the town. Stay Overnight in Bath to visit the Harry Potter locations nearby
Day 7: Head to Edinburgh today
Day 8: Hop on to the Hogwarts Express today
Day 9 : Explore Edinburgh Castle and take a harry potter walking tour
Day 10: Durham Cathedral a Harry Potter location
Day 11 : Drive to the Loch Etive lake

The summer months of May, June, and July is the best time to visit London. London is less crowded. London is less crowded during the shoulder season, which comprises mid-September through November, March through April.