Not getting guaranteed download speeds. Have been user for many years. Have done all checks advised.
Have you done a factory reset to the router indicated in the link below?https://help.nowtv.com/article/improve-broadband-speed
Otherwise call the broadband team and ask for full investigation of the line, could be a fault as far back as the cabinet. See link below for number.https://help.nowtv.com/article/how-to-submit-a-broadband-complaint1