One of the more impressive and enduring LEGO sets for adults (well, ages 16+, anyway) is the LEGO Ideas Tree House. It's a massive three-unit tree house you can build with either green leaves or yellow leaves for an autumnal feel. It normally rings in at $250, but it's on sale for $75 off for Prime Day. Grab it before it's gone.

The elves' sanctuary at Rivendell – scene of a pivotal meeting in The Fellowship of the Ring – is represented in a highly detailed, 6,167-piece LEGO set. Launched only last year, Prime members can save 15% on the usual RRP with a deal price of £365.

I search for deals for a living and these are the best Amazon Prime Day Lego deals I can find with Lego Star Wars, Marvel and space sets reduced.