London visit - recommendations please

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I'm planning on visiting London with DC, age 10.

We've done most of the sights before, I'm just wondering if there's anywhere you'd recommend visiting? Cheap or free even better.

We're going to go to Camden but other than that we're open to ideas!

Thanks in advance.

Maybe the young V&A? It's free

There's a Postal Museum including a train journey underground. I'm planning on taking our family (kids are 8 and 14). We have also done Treasure Trails in London too, a great way to walk around with a purpose. Buy and print in advance and bring a pen!

Mine of the same age loved the Museum of London, Docklands.

Will check them out, thank you!