The moving of the clock was invented in 1907 by a builder named William Willet, (or something like that). He pettisioned parliament, saying sunshine hours were lost whilst people slept, and at the end of a normal work shift the sun was about on the horizon. Although they agreed with him nothing was done until, in April, 1916,
Daylight Saving Time was introduced as a wartime measure of economy, not only in Britain but, within a week or so, in nearly all countries, both allied and enemy. Sadly, William had died the previous year so never saw his idea put into effect.
Most countries abandoned Daylight Saving Time after the war had finished , most reintroduced it eventually, and some even began to keep it throughout the year.
In 1968 to 1971 Britain tried the experiment of keeping BST - to be called British Standard Time - throughout the year, largely for commercial reasons because Britain would then conform to the time kept by other European Countries.
This was not good for the school children of Scotland as it meant they had to always go to School in the dark. The experiment was eventually abandoned in 1972, Britain has kept GMT in winter and BST in summer.