WHD Criteria

assets.publishing.service.gov.uk/governm...d-wales-annex-1.xlsx

Here is the list of properties that state ‘high energy use’ or ‘low energy use’.
You can look up the size of your property using the EPC criteria. It states the SIZE of your property which you need to know (and the rough time your property was built).
Get this information together before phoning the helpline.
If you know you ARE eligible you can then argue with them.
The information they have isn’t necessarily accurate.
They told me I wasn’t eligible. I knew I was and told them so.
I will now receive WHD.
As usual everything is made complicated so people go away.
Find out properly x
Get some help from Citizens Advice or another help agency if you need to.