It's in the northern sky. I first saw it at 8pm, it was still the same an hour later. I can't see the northern sky clearly where I am now, but it's coming up to 1am and I can still see a red glow in the same place (it's more pinky red than the photo shows).

Any idea what it could be? I'm assuming it's not a natural phenomenon given it hasn't moved or changed. I'm reminded of that tomato factory incident, but I don't know of any tomato factories in the area.

Edit: solved. It was coming from Spurs stadium and is probably lights to speed up grass growth.