MI5 decides to run with two extremely crucial but unverified pieces of intel from a single source? Book readers how is this handled in the books?

The Libyan lady gives up the code which probably downloaded more malicious code when MI5 ran it. She also mentions "bodies falling" These are two seemingly crucial pieces of intel from a single unverified source, in this case a suspect which would not pass any HUMINT standard and they just run with it? These agencies generally follow the rule of "Intel that's unverified is intel that's dangerous" Planes about to fall off the sky is not a real threat in post 9/11 secure world hence injecting malicious code into their database seems extremely silly violating all and any OPSEC. Book readers, how does this plot play out in the book?