I was outside at the address in liverpool and looked up up see this strange vapour trail with puffs on it like knots on a rope, unlike regular vapour trails from local planes-as there is an airport nearby. it reminded me of the aurora vapour trail sightings so i snapped 3 pics. i didn't see the craft in question as it was either too high or had moved on. it was flying in a wide circular motion towards the nw. it didn't bother me too much as i know about ets/crashed crafts/tr3bs etc. what did surprise me was that this occurred in the uk. the vapour trails eventually just expanded in size and disappeared into the surrounding atmosphere.