The engineer visit has finished. The engineer reset the broadband and I'm waiting on the 10 day stabilisation period now. He also said that I'm too far away from the fibre cabinet to recieve the minimum guaranteed download speed. Should I send back the test router (Wi-Fi Hub) since my current Super Router wasn't the problem?
I tried another speed test on TalkTalk's website with my laptop connected to the router by ethernet cable. The speed was 51.7Mbps so no improvement. The engineer said the speeds I'm getting now are the highest my connection can support after stabilisation, and that it wouldn't be able to reach the guaranteed minimum speed. I'll send the old router back with the returns bag.