Where I was working tonight, we were outside all shift, & a few of the people around us spotted the same loop.
Several of them told me it was evidence of chemtrails and stated that this was obvious because of the loop (as "otherwise it would have just gone in a straight line").
I pointed out that the runway state at Gatwick (by which I mean the direction in which aircraft take off & land, either east to west or west to east) changes regularly, sometimes more than once in a day, depending on wind direction, and that this particular vapour trail simply pointed to the runway being used on a 08R configuration rather than a 26L. The aircraft in question had clearly either approached or taken off from that direction and was having to turn according to instructions from ATC to make the correct bearing for its destination.
There are also issues with noise & flying over built up areas which might necessitate the particular loop seen tonight.
To my astonishment, the perpetrators of the chemtrail theory seemed to accept this, although they continued to insist the trail was all part of the Big Conspiracy to poison us all (strontium, aluminium & barium, since you asked).
I saw that from Seaford looking west (so it definitely wasn't anywhere near Polegate, and it was a jet anyway). It looped and then appeared to head upwards. Quite odd.
I saw the same thing over seaford I wondered what the hell it was doing
That is really weird......there was a vapour trail identical to this over Caldicot this evening, it looked like the jet had done a sharp U-turn. (Caldicot is near the Severn Bridge in South Wales).
Oh and I noticed it after picking my daughter up from gymnastics at.......8 pm tonight. It couldn't be the same one could it?