I have been advised that both the E.On and the Ovo Warm Home Discount Broader Group schemes have now closed for 2016/17.
The E.On page is saying that you can still register people for next year, but not for but 2016/17 - https://www.eonenergy.com/for-your-home/saving-energy/need-little-extra-help/warm-home-discount
The Ovo page is saying that they are accepting applications, but when you click on the link to make the application, you get a message saying the scheme is closed. https://www.ovoenergy.com/ovo-answers/topics/payments-and-statements/payments/what-is-the-warm-home-discount.html
I hope this is helpful - keep me posted if you hear of anymore schemes closing so we can keep everyone up to date.