Do visit the Hampstead Heath Ponds which is set in the midst of the gorgeous heath, the three ponds offer a slightly chilly dip surrounded by wild shrubbery!
The worst airport I've ever been to. Transportation is difficult, staff is unfriendly. Dutyfree has limited options and is relatively expensive. Use other airports if possible.
London Stansted Airport serves 200 destinations across Europe, Middle East and Africa. It is the fourth busiest airport in the UK after Heathrow, Gatwick and Manchester handling 28 million passengers in 2018.