Well, to be honest, I doubt that UK Police can do anything in this case, because the IP adress of the site belongs to a hoster in Skopje, North Macedonia. So things might get a little complicated if I (citizen of Germany) report to UK Police a fraud site in Macedonia 😉
Nonetheless, I think your idea is a good one and I really should not just ignore this. There is a abuse adress of the hoster in the whois database. I think I will leave a message there.
Bye, Dirk