I saw what looked like a blue satellite going over the UK at around 23:18 -23:22 UTC (00:18-00:22 BST) tonight it went from west to east.
It did not seem to look like aircraft navigation lights, because it didn't look like it was flashing, and it was a lot more blue than green. It also moved a lot like a satellite, straight and arching path/trajectory.
Here's a photo I took at 23:20 UTC:
With a Nikon D7100 (DX (APS-C) format DSLR) with a 50mm lens with the settings being: 8 sec, f/2, ISO: 800, +5EV. I haven't edited the photo this is the off camera jpg.
Same settings clearly showing Lyra at 23:21 UTC:
I think I might have seen it on Friday night (into Saturday) when the aurora was visible.
I have seen slight hues on satellites before like Envisat looked slightly orange, but still I've never seen such a deep colour before.