According to market research firm Mintel, a quarter of British people are now drinking non-dairy milks.
That said, 96% of milk sales in 2018 were still for cow's milk, with plant-based milks making up just 4% of the milk market. The kinds of plant based milks you can buy include soy, oat, almond, cashew and rice milk. Although I am not sure if you can truly call them "milk". How do you milk an almond? Well Paul McCool answered this question on Quora, and it is hilarious. I am sure it applies to other plant based milking techniques.