if you are in london anywhere near paddington swing by the lisson gallery and see the julian opie exhibtion. the main feature is a vr headset experience of a virtual exhibtion. it's pretty well done. i am a big fan of his work – just the simplicity of it. if you've got kids and are looking for easter holiday things to do for free then i think they'll love this. btw this photo is not the vr part of the exhibition!