Keep your NGK boxes

Had a very eye pleasing rep in today from NGK. She said that we were to start saving spark plug boxes and NTK sensor boxes. They would send out a pre paid box to put them all in and send them back. You get points for every box and until June or July, can't remember which, all NTK boxes were worth 1000 points, which is worth £10 in their online store. Not had a look what you can get but its something for nothing I guess.

Anyone else had a visit?

Edit - just realised I spelt NGK wrong in the thread title. Lol. Can someone change it for me?