Help Identifying Plants

Can anyone identify the following 2 plants. We think the thistle type one might be known as Sea Holly - but is it a particular variety? The white flowers - we have no idea! They were in someone else's garden but we'd like to get some. Any advice on growing these appreciated too. There is a further plant we'd like help with, but I'll put that as a separate post to avoid confusion (ours!). Thanks

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