UFO Sighting in Corby, England on 2017-08-04 18:00:00 - Flat dull non-reflective disc that travelled extremely fast and then under cloud cover. no apparent features.

From my room i have a huge window that looks out over the back of my house and above some crop fields. i saw a flat dull disk flying over in a direction planes never fly in. it also left no emission and was travelling far too fast to be a plane. it was chrome but dull, it almost didn't seem like it was real due to the lack of reflectiveness on such a bright day. it travelled in a straight line for a few seconds before it disappeared under cloud cover. i had a thought to grab my phone to film it but it was moving so fast and disappeared so quickly i didn't have time to.