So it was an average of 50 a week in 2018 versus the first few weeks of 2019 where it has been an average of 60… not sure that’s a great start to the article, comparing 52 weeks to 5 
Typical click bait from The Sun, not that I’d expect anything less. My honest guess is AML and KYC, but I could be wrong. If it’s AML the bank has no obligation to tell you anyway as this will tip you off for other accounts you may have.
Ultimately, always make sure you have at least two accounts so that if one does get closed you already have a second. If it’s closed due to fraud/AML then you may well be without an account at any bank.