The customer authorization (provided in the link you clicked) is out of date, and does not entitle you to use the Blended Threat service.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://lcr.evolutive.co.uk/eNews.aspx?sid=1331629&surl=https%3A%2F%2Fassets.publishing.service.gov.uk%2Fmedia%2F5d15e4a8e5274a0697823ee0%2FPA1_LCR_YNYER.pdf