The official reporting agency in the U K. is Action Fraud:
https://www.actionfraud.police.uk/We tend to think of them more as "Inaction Fraud" as you probably will never hear back from them unless you have lost over 100,000 pounds.
Please file a report there anyway.
Make a copy of the report and take it to wherever you sent money through and try to get any payments reversed.
Another Entity in the U. K. taking crime reports is:
https://crimestoppers-uk.org/File a fraud report there too.