Speed to broadband hub very low

[GH999]

Hi, I've been having trouble with my WiFi for the last few weeks, I've just completed a speed test on the mysky app and it came back with a reading of 5.2mb/s and a 'poor' speed to hub status. My minimum guaranteed speed is 43mb/s and I was getting around 61mb/s up until a few weeks ago. I've contacted sky (automated response) and they said there's not issues found. Any help on why this is so slow please? 

[Highlinder]

@GH999 Could you please post your router stats following the link below.
https://helpforum.sky.com/t5/Broadband/How-to-find-your-Sky-Broadband-router-stats/td-p/2855717#M101...