During the summer the UK is on "A" time (which is the same as BST), so sometimes people think that Z is UTC/GMT and that "A" means Local (in other words that A=Z in the winter.) This common misappreahension is, AIUI, not right at all.
The only time bands referred to in this country are A and Z, and aviation runs on Z almost everywhere, but in the CIS they run on Moscow time and in China on Beijing, which can be seriously confusing if you are flight planning across the borders.
W