yes, for the flexibility. lot of fixed term limit the overpay to 10% of the amount owed each year, check you're not running into that and adjust the years accordingly.
There is an appeal in setting the period to ten years and just paying the £1,200, having that cost gone would be nice. That said I probably spend more at Pret each month than the current mortgage costs me, so it's not a huge thing I suppose.
Two options with the same mortgage (2 year fixed at 1.14%):
Select a term of 10 years, pay £1,200/month
Select a term of 20 years, pay £650/month and overpay up to the £1,200.
Why am I considering option 2? Because overpayments come off the capital, not a combination of interest and capital.
Would this make sense to do?