As it happened, the foreign interest were properly documented in the parliamentary "The Russia Report" of 2020 (and not only). I don't think we can ignore any of this in good faith.
The response to that report said that "We have seen no evidence of successful interference in the EU Referendum."
yet Boris is selling seats in the House of Lords to Russians and they tried to stop the release of the report. So to assume they didnt have a hand in editing the findings is perhaps putting too much faith in the UK government. And right now, any, is too much.