After switching everything off and back on twice, I finally managed to get a speed reading in Modem mode on the laptop. Just the same, 200mpbs+. I've tried different ports for the pc, speeds are always around 80mpbs. Photo below showing the back of the pc, solid green light and flashing amber light. Not entirely sure what that means. I've also attached a short video of the hub ports showing the lights, pc is in port 3 at the bottom. Any ideas? I should reiterate I was getting 200+ mpbs on the pc before I changed the hub.
I don't think it did, but I've switched off the wifi on the pc and done another test, slightly slower than before, 74mpbs. This was connected in router mode, I work from home so I can't keep switching between modem and router.
I didn't use the same cable, that's a bit awkward due to the layout. I can try and change the cable, but as it's the same cable I was using before it's unusual that it would become faulty in some way simply because I've unplugged it from one router and attached it to a different one. But, I will try and find the time to follow up on your suggestions and I'll let you know.