This is a topic that isn't going away, and I think these NHS trials will be used as a Trojan horse to prove the way for commercial operations - here's a link to a map of projects that this one company are promoting.
Of particular interest to us in the north is the proposal for the intra-Trust delivery of nuclear medicines for North Cumbria integrated care NHS Foundation Trust which could well abutt the Northumbria plan potentially creating a coast to coast TDA - a modern Hadrians wall!
Apian - drone projects