The customer authorization (provided in the link you clicked) is out of date, and does not entitle you to use the Blended Threat service.
https://www.google.co.uk/search?q=northumberland+fa+contact+number&rlz=1C1GCEA_enGB809GB809&oq=northumberland+fa+con&aqs=chrome.5.69i57j69i60j69i61l2j35i39j69i59.6328j0j7&sourceid=chrome&ie=UTF-8