I saw this today over by Milton Keynes and it kept going on for miles and miles but it was all just construction work so I have no idea what it is.
I assume it’s either a motorway being built or maybe a trainline to up north/midlands? Possibly HS2 or is that a completely different area?
Edit: For People asking exactly where I was, it was by Turweston Aerodrome, Brackley. Which is west of Milton Keynes