A clone is not genetically modified. It is technically an identical twin of the original animal or plant.

Every potato plant grown from a seed potato are clones of the original plant which produced the seed potato. That plant in turn was a clone of an earlier potato and down the line perhaps hundreds of years.
Every Bramley Apple tree is a clone of the original tree that a cutting was taken from. The apples themselves are the product of a fertilised flower, so their seeds are NOT a clone.

As I understand it, the animals on whatever British farm were calves produced naturally. It is the mother cows which are clones of a particularly high quality milker.

I have more confidence in the cloning process than with some other things done in the name of science. If cloning is done right, the cells should be 100% identical with the original. If the cloning process isn't correct the cell doesn't survive, so there is no offspring at all. You either get a perfect copy or nothing.

Quack!
GtD.