After a puncture in one of the front tyres, I decided to replace the OEM Yokohama Blue Earth with the Cross Climates which were fitted earlier today. As I have mentioned before, I love the x-climates and have had them fitted to my previous NX and to RXs before that as well as to our non-Lexus cars. I replaced all 4 tyres as it is best to have the same tyres all around on a AWD vehicle. Interestingly, the rear tyres appeared to have plenty of life left in them, but showed cracks in the inside of the grooves, which was a bit of a surprise.
Unusually, my local Lexus dealer were not able source tyres from their usual suppliers, so I went to Protyre.co.uk, who have fitted tyres to my cars before.
https://www.protyre.co.uk/search#/car/225/60/18/any/H/nonrunflat
Cost was £152.00 per tyre.
Note that these are Cross Climate SUV, which apparently are being phased out (which explains the reduced stock) and replaced with the Cross Climate SUV 2, which do not appear to be widely available as yet.