Within easyJet, the Cabin Crew normally make the following announcement:
Ladies & Gentlemen
For operational reasons the Captain has considered it necessary to climb back up rather than continue the landing on this occasion.
This is a completely normal procedure and is not a cause for concern. The pilots will give us more information as soon as possible. In the meantime please remain seated with your seatbelt fastened.
Thank you.
After a couple of minutes, the pilots will make an announcement once they have finished getting the aircraft back into the hold and finished on the radio with ATC.