Hi Ian.
Why would anyone want to do that on the same axle
one of my pet hates is seeing a car with different tyres, even if they have same type on each axle, i have to put the same tyres on all four corners, one it looks better, it is safer in my opinion.
On all Freelanders 1&2 they must be the same have the same tread depth other wise damage can be caused to the drive train.
Tyres are the same as your brakes in terms of safety, they are must be kept in good order including the right type for the car.