Any individual made a member of the Order for gallantry could wear an emblem of two crossed silver oak leaves on the same riband, ribbon or bow as the badge. It could not be awarded posthumously and was effectively replaced in 1974 with the Queen's Gallantry Medal. If recipients of the Order of the British Empire for Gallantry received promotion within the Order, whether for gallantry or otherwise, they continued to wear also the insignia of the lower grade with the oak leaves. However, they only used the post-nominal letters of the higher grade.
They continued to wear what the insignia of what?
lower grade with the oak leaves

In November 2014, Sony Pictures Entertainment was targeted by hackers who released details of confidential e-mails between Sony executives regarding several high-profile film projects. Included within these were several memos relating to the production of Spectre, claiming that the film was over budget, detailing early drafts of the script written by John Logan, and expressing Sony's frustration with the project. Eon Productions later issued a statement confirming the leak of what they called "an early version of the screenplay".
What company confirmed that an early version of the Spectre script had been leaked?
Eon Productions

Greenwich Mean Time (GMT) is an older standard, adopted starting with British railways in 1847. Using telescopes instead of atomic clocks, GMT was calibrated to the mean solar time at the Royal Observatory, Greenwich in the UK. Universal Time (UT) is the modern term for the international telescope-based system, adopted to replace "Greenwich Mean Time" in 1928 by the International Astronomical Union. Observations at the Greenwich Observatory itself ceased in 1954, though the location is still used as the basis for the coordinate system. Because the rotational period of Earth is not perfectly constant, the duration of a second would vary if calibrated to a telescope-based standard like GMT or UTin which a second was defined as a fraction of a day or year. The terms "GMT" and "Greenwich Mean Time" are sometimes used informally to refer to UT or UTC.
When was GMT adopted by British Railways?
1847