This only affects you if you pay the Vale by bank transfer or standing order. Direct Debit payments are NOT affected (so 81% of is aren’t affected.
Anti-fraud measures taken by the Vale’s bank mean a new sort code number.
For the details, see the website: http://www.whitehorsedc.gov.uk/news/2018/2018-02/extra-bank-security-means-changes-some-council-tax-payers