If you have a toddler who loves to build then Lego Duplo is a great place to start encouraging their skills. This starter set of Lego Duplo Build and Play Cubes is only £7.50 online at Tesco Direct, and it's at least £10 everywhere else so this is a really good price.
It's a 17 piece set where the lid doubles as a handy base to build on and it includes large blocks, windows and different shaped pieces to spark the imagination of young builders. It may help toddlers start to build something other than just "big towers!", at least that's what I'm hoping will happen in our house!
This set is suitable from 18 months to around 3 years, and from age 4 children can move on to the proper fiddly Lego bricks.
You can get the Lego Duplo Build and Play Cubes delivered for £3, or you can use the click and collect service to get this from any Tesco store for free. As it's in the clearance stocks may be limited, and it's only whilst stocks last.