We have been served section 21 but not because they want to sell (no sign up etc). Suspect it's to cash in on rising London rents as we have been in this house for 4 years.
Finding a new home is becoming a nightmare. For example I had been waiting for a call back about arranging a viewing on a house; two days later I called back to give them a nudge and someone had PAID THE DEPOSIT over the phone without even viewing! It's crazy out here... anyone else in the same boat ?