On all current leases mileage is locked and agreed at the point of Application (1st visit to dealership) for the duration of the lease.
So your included mileage will be 20,000 per calendar year (60,000 on a ‘regular car’ 3 year lease) and will not change while you have your current car.
However if you terminate early for any reason, you only get the ‘daily equivalent’ of the mileage allowance; 55 miles per day that you had the car.
As per condition 2.4 of the lease (October 2025 wording):
2.4 When requested to do so, you will pay to us Excess
Mileage Payments, of 5p per mile for every mile
in excess of 20,000 miles per year of the Hire
Term, together with any applicable Value Added
Tax. Where the agreement is terminated early for
whatever reason, when requested to do so, you
will pay to us an Excess Mileage Payment of 5p per
mile for every mile in excess of the pro rata annual
mileage allowance
