If an employee's contractual holiday entitlement is a number of days "plus eight bank holidays" are they entitled to an extra bank holiday that is granted one year?

No. Where a contract stipulates that an employee's entitlement is limited to the normal eight bank holidays in England and Wales, there is no automatic entitlement to an extra bank holiday that is granted one year, for example for the Queen's jubilee.

There is no statutory right for employees to take bank holidays as leave; the right to do so is down to the terms of the contract. Unless the employer decides to modify the terms of the contract to allow an extra day, there is no right for an employee to take the day off.

If the contract states that holiday entitlement is a certain number of days "plus bank holidays", without specifying the number of bank holidays, employees would be entitled to the extra day.