Thanks Lee. At moment I'm getting 44Mbps, which I don't think is too bad, but obviously didn't test my speed during the game as I was trying to watch it. I've been working from home during Covid and there is a huge downturn in the performance of the works IT network at peak, times of day compared to out of hours, so I think my Internet performance is a bit variable.
I hadn't realised there was a cog to reduce the screen quality (only able to watch on a small tablet screen), but will try that next match. I don't think it's an issue with being too far away from the router as I can watch programmes on BBC iplayer, etc, on the same device in the same seat without any performance issues.