UKCasual

Oatly should be widely available, otherwise most supermarkets now make their own brand. Personally I'm a soya milk drinker, so can't really recommend any though.

As for meat replacements - there are a lot, you can pretty much replace anything now from nuggets to donner to roast (like roast "chicken" or "beef", either whole or in pieces) to cold cuts. It's hard to say which you would like because they vary in texture and flavour, so I'd just start trying them out!
Some brands I personally enjoy - Squeaky Bean, Oumph, Vivera. But most supermarket own brands to really good stuff nowadays, even Iceland (if you don't have a store close by, they all deliver).