Best developmental and learning toys and activities for a 1 year old?

His birthday is coming up in less than 2 weeks and I want to get things that can help his development. He's getting an activity cube walker, so will encourage walking and playing at the same time. But what else do you get for a 1 year Olds development?🤔

Any recommendations so appreciated!🤗

I'm in UK so will have to be something that if online shopping I required, it can be delivered in a week at most.