E.ON are running a 'Wheel of Extras' competition on their website (https://www.eonenergy.com/for-your-home/nice-little-extras/wheel-of-extras) at the moment.
This is only for existing E.ON customers - sorry!
You just need to register, and you'll get the chance to spin each day.
-Sky Q with Sky Cinema package for a year
-Home theatre kits
-Amazon Fire tablets
-High street vouchers
-Lego Star Wars kit
...plus entry into a prize draw for £1500 :)
Competition ends on 8th January 2017.