Low flying plane

On my dash home from work, detouring via Colinsburgh to get petrol I was given a surprise when this plane stooped VERY low across the road and over the fields to my right. Being on a quiet road I managed to stop and take a few snaps. I have no idea what it was doing but I genuinely thought it was going to crash, it was that low!! It wasn't a small plane either, much bigger than an RAF jet for example. After a long day at work I am so happy to have tomorrow morning off. Probably won't manage anything productive but just do some much needed chilling!