concerning

“I think the Fed is looking at that, and it’s concerning to them.”

There was even advance warning from England that an announcement concerning Mark Wood was due - not usually a sign of optimism.

The professor, who had not seen the documentary before speaking to the BBC, said he found the DNA analysis both exciting and concerning.

Still, what could be concerning is that recent selling by whales has been coinciding with deteriorating sentiment and slower buying, which could add further pressure to bitcoin’s price, according to analysts at blockchain-analytics firm CryptoQuant.

Online safety expert David Wright CBE said it was "really concerning", but added "in large part it's going to take time" for change to happen.