Welcome to 1937, a few months before the historic 100th year of Queen Victoria's reign, and the jubilee calibration is eagerly anticipated by most of her subjects, even if she hasn't been seen in public for 30 years, and there are strange rumours of robotic implants and that she can no longer leave the throne…
There is threat to her reign, the person who would be in our timeline George V, is a guerilla warfare activist, unhappy at the prospect of being the eternal heir apparent, as his farther is, the would-be Edward VII.
Science has moved on apace, but is different to in our world, effectively anything discovered in the 20th century does not exist, there is no nuclear power, the atom is indivisible. Evolution follows Lamarkian rather than Darwinian lines. Steam-power is king and the only internal combustion engines are rare and clunky things.
Various sciences have blossomed, however! The discovery of the remarkable Chronophage insect has done wonders to the science of time-travel, and electrical technologies are very advanced, but in a somewhat different way to our own.