Huge thanks to @gamesquest1 - I sent my console on Friday and received it back this morning (Tuesday)
Everything looks great and works as it should. Thanks again! Highly recommended to anyone in the UK!
My nieces love the LEGO games. They're around the same age as your two as well. Animal Crossing New Leaf would be good for the 10 year old as well.
and obviously, anything Mario and Sonic wise.