Sounds like a non starter.
There will be some situations where police officers will be asked to identify themselves. And, in some situations, it is a requirement that they produce their warrant card to do so, without being asked.
The main feature of a warrant card is the photo ID part. So, I'd imagine that wearing clothing that completely, or substantially, covers the face would frustrate the intended use of said card.
It's nice that we have police forces wanting to encourage all groups in society to join the police. I suspect that this is what is going on here. But in reality, I doubt we'll see police officers wearing the burka.
So all in all, TSR has four pages of Islamaphobia... and all over nothing. Nice.