Well, if they required FOI request and £10 I wouldn't mind. Again, was not asking them to confirm that I could build a specific outbuilding, just to say "yes, your house has PD", it shouldn't be a research but a DB check question. This way they basically force me to pay the full fee.
It's quite surprising there is not a simple checkbox on a planning portal for this yes/no information. All that IT effort - and they don't really use it properly. In our case there was a full PP process so I'd hope they could make checks as a part of it.