The motorhome challenge where they go to Cornwall is my favourite ever Top Gear. It wasn't a big budget episode but there's something about it that's iconic.
Most memorable car - "block of flats on top of an old Citroen"
Most iconic laugh - "I asked James to assess the situation but he wasn't much help"
Ultimate troll of BBC brand rules - "I can't tell you, but you know of course they're Jaffa Cakes".
Other notable ones are the Nile in estate cars, Burma lorries, Oslo race, amphibious cars across the Channel, teenager cars.