My reply was as follows;
Your warranty has a time interval as well as a distance limit. What does you manual say about time?
So far as synthetic motor oils are concerned, you could easily go for 4 years, as I do with my Porsche (10k a year).
But your warranty is important, especially on a MINI.

Another time versus distance conundrum arises with very low mileage cars and their timing belts. The correspondence
on this subject goes on and on. No one really knows whether time is as important a factor as distance when it comes to
changing this belt, which is quite an expensive job.

For example, if your car is supposed to have  belt change at 120,000 Km (72,000 miles) but you've only covered  60,000 Km
(36,000 miles) during an equivalent time period, should you change the belt or not? The problem is that if the belt breaks on
almost all cars, the damage to the engine is catastrophic and the only way to properly assess the condition of the belt is to
take it off and bend it backward to see if the teeth have started to separate.

By which time, we're more than half way through the work required to change the belt anyway.

If the oil seals or the water pump start to leak, then the answer is a no-brainer.
The belt is now contaminated and its' expected service life just took a nose dive.

If on the other hand, no liquids start to ooze from behind the timing belt cover, then my assessment is that such a belt is
probablygood for about ten years or so.

But for $450 on average, maybe you don't want to take that chance. Each case has to be assessed by us on its' own merits.