Best answer by Nancy_Boost
If you applied for the Warm Home Discount, and Boost approved your application your payment should be made on or before the 31st March.
However, if you switch away before the payment has been made, unfortunately we won't be able to forward it onto your new supplier. If you normally don't have to apply for the WHD (you're a member of the Core Group, who receive the guaranteed element of pension credit), your payment will be sent to you by whichever supplier you were with in July 2018.
You should have this any day now.