I am enjoying the series, if I close my eyes during the gorey scenes where history is being mutilated....
It's impossible to be 100% accurate, but sometimes the mistakes are distracting. Like many contemporary productions, this series fails to understand how people behaved in the past. There are two instances in particular that particularly stand out.
In 1890 London, the molly house with two men dressed up in corsets on the street simply wouldn't have happened in daylight in front of the police because they would have been immediately arrested. It wasn't okay to act gay in any way in public in 1890.
The other most egregious errors occur in the 1941 blitz scenes, with people screaming and running for shelter from their apartments while bombs are falling in the neighbourhood, and the crowds then being denied access to an underground station for shelter. Anyone who has ever talked to anyone who lived in London during the Blitz knows that Londoners were prepared and calmly resigned to the bombings. There were usually many minutes between the first alerts and the first bombs - enough time to make a thermos of tea and dress warmly. There were also alternate street-level shelters to the undergrounds, and many people just defied fate and waited it out at home. As well, the cars have too much light being projected from the head lamps, and the detective's apartment had no blackout curtains, so sitting in the apartment with the lights on was illegal, and he would have been fined or arrested. Covering light from windows would have been tested in drills by ARP officers from the home army in the early months of the war, well before the Blitz began.
It's too bad these blatant errors exist because they pull down the quality of the production. Period set films really need historians to check basic facts, and directors need to LISTEN to them.