This meta question states that recommendation questions are on-topic. However, as I am new here, I don't want to commit a fox's foot (faux pas ;-), so please vote to close, rather than downvote, if I have posted wrongly (or, just ask me to delete the question). Thanks.
As soon as I get a single answer here, I will delete as duplicate my as yet unanswered Hardware Recommendations question Cheap programmable drone, for use in the UK, which reads:
I am looking for a cheap, programmable drone, for use in UK, to use in a Minimal Viable Product for a system that will later use more highly spec’ed drones.
• Needs to accept a programmed flight plan (*)
• Needs to carry an ESP32 (approx. 10g) and a coin cell battery (2.9g), possibly an altimeter of GPS sensor (I would guess 5g, max 10g)
• Long flight time is not important, but I would like 5, preferably 10 minutes
• Outdoor use, not indoor, although I can live with being restricted to calm days
(*) I am not sure if UK law requires a human drone operator, rather than a programmed flight plan. If that’s the law, I will comply, but I have a strong preference for programming a series of waypoints.
[Update] do I need to be licensed to fly a drone in the UK?
I hope that this question is specific enough to be acceptable. Basically, I am looking for a quick & dirty demo (don't want to spend £ hundreds, in case no one bites at the idea), to demonstrate how a drone with an ESP32, or similar, can be automated to fly over sensors and collect data via Bluetooth Low Energy (BLE).