Is there a way to see a list of blocks used in a site?

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We have a site where we tested a bunch of third-party add-ons several months ago, now the site is ready to go live.

But we can't quite remember what blocks we ended up using - is there a way to see which blocks are used in a site?

Wouldn't mind deleting some of them before moving them to the LIVE server.

Cheers

Ben