There has been some very heavy chemtrail seeding over Oxfordshire today, some of the worst I’ve ever seen. As you can see from the photos we experienced multiple overhead trails of varying thickness and density running mostly southeast to northeast with a couple of east-west trails too. They were deposited in a very precisely-bordered area to the southeast of the city of Oxford in a grid pattern overlaid with diagonals. The deposit began at about 2PM and a patch of milky haze soon covered the previously blue sky. The haze came in from the southeast which could mean that some more seeding operations were carried out over the horizon in that direction (Let me know if you were there and saw any!). Beside the chemtrails I saw some odd plaited-shaped clouds, sitting on their own in the middle of the sky (Second photo down, but by the time I got my camera they had been joined by natural clouds). This phenomenon was accompanied by unusual aircraft activity. I was two EH101 helicopters (http://en.wikipedia.org/wiki/AgustaWestland_EH101) flying low over the city centre and a pair of vintage fighters: Spitfires or Hurricanes. There are only two air-shows in progress today, at Newark, Nottinghamshire and Kemble, Gloucestershire; none of the aircraft I saw were heading in the right direction for either of them.