Yep, £210 is pricy - however it's a bespoke size and tread pattern so it's not hugely unreasonable. Within reason, the price wouldn't bother me that much - they're unlikely to wear too quickly and unless damaged shouldn't need replacing that often. Which kind of was part of the concern - there's not much incentive for a tyre manufacturer to keep manufacturing a bespoke tyre, if it's low volume.
Anyways... I've come to the conclusion that it's not an issue to be concerned about now - better to buy and enjoy the vehicle without worrying too much about what the future might bring.
