Animal welfare: Is it safe for cats to be vegan?

Is it OK to feed cats a vegan diet?

Alongside a growing trend of veganism, more cat owners now want to share their animal-friendly values with their feline companions.

That preference sparks a serious question that scientists, vets and vegans' can't agree on - can cats be vegan?

BBC News has been to see Joanna Farr, an owner with two vegan cats.

Video Journalist: Adam Paylor