Please break the active link to a suspect site to avoid accidental exposure e.g. no htt*s, etc. "lloydsbank.com/investing.html"
That said, I have just visited the link and no Avast Antivirus alert (see attached), also so it doesn't appear to be the Avast Antivirus program blocking the link you provided.
Going deeper it is only when you try to login that you get the alert, see 2nd attached image, is this what you are talking about (posting an image of the alert window would have helped).
You can use the - Reporting a Possible False Positive File or Website -
https://www.avast.com/false-positive-file-form.php.
You should get a response in a day or two.