I wandered out into the garden this morning, looked up and saw this 
By the time I’d got the camera the trail had begun to disperse but it went on for miles. I sat for another hour with the camera but didn’t see anything similar.
The flight was heading West to East from my place towards Heathrow but it was too high to be landing there. Anyone else see it?
It might have been KLM751 at 39,000 feet
https://photos.flightaware.com/photos/retriever/ed5cb1176c294f4acc4c0a2f73be4ae87df25a3e
Looks like part of “Surrender Dorothy”…
LOL! (Really, not kidding. I actually LOL’d.)
More efficient dispersal of chemtrails that way. 
Just saw an old lady fly by on a bike with a dog in the front basket
Cheers!
LitterBug
Really big winds here yesterday with a small dog alert:
METAR text: KOSU 212053Z 25022G35KT 10SM SCT100 16/M07 A2970 RMK AO2 PK WND 28038/2007 SLP055 60000 T01561067 58003
Conditions at: KOSU (COLUMBUS/ST UNIV, OH, US) observed 2053 UTC 21 April 2015
Temperature: 15.6°C (60°F)
Dewpoint: -6.7°C (20°F) [RH = 21%]
Pressure (altimeter): 29.70 inches Hg (1005.8 mb)
[Sea-level pressure: 1005.5 mb]
Winds: from the WSW (250 degrees) at 25 MPH (22 knots; 11.4 m/s)
gusting to 40 MPH (35 knots; 18.2 m/s)
Visibility: 10 or more miles (16+ km)
Ceiling: at least 12,000 feet AGL
Clouds: scattered clouds at 10000 feet AGL
Weather: no significant weather observed at this time
Cheers!
LitterBug
Your description of ‘West to East toward Heathrow’ doesn’t even remotely match up to KLM751 on that date:
http://flightaware.com/live/flight/KLM751/history/20150411/2335Z/SEGU/EHAM
Didn’t check FlightAware or FlightRadar24 to see what was overhead at the time? 
Matt
–