WiFi Very Slow After Area Outage

[bmorris]

Internet was out for a few days due to an outage in the area - fine, but since this was sorted the WiFi has been so slow that it is not even usable. Essentially been without WiFi for over two weeks as a result. Sky connection check on this site says speed is 75MB/s but can see by running the Google internet speed test that it is 0.2Mb/s in reality. Pls help?