I had a look at Blockley's site, and though they don't have that specific size, it's encouraging to read that they will look at manufacturing to order.
I thought about the potential to fit different wheels, but can't think of any wheel/tyre combo that would give the same (or approximate) overall diameter; if it's smaller that would affect ride height, and possibly the steering geometry.
Good to know though that there are potential alternatives, it's put my mind more at ease. It was a bit of a wobble moment - imagine spending 50k plus on a vehicle and in 10 years time it's worthless because you can't get tyres for it.
My thinking was - almost every other component of the vehicle could be substituted or remanufactured, but tyres would be a problem.
