That's correct, with BST in the Summer. It can get confusing when working with people from different countries who aren't aware of BST and who schedule meetings explicitly in GMT, thinking that it automatically includes daylight saving.
It's also a problem for software engineers in the UK, for whom 6 months of the year utc and local time are the same, resulting in people not knowing the difference. In the rest of the world it's bleedin obvious.
British Standard Time existed all year (~50 years ago) but British Summer Time is defined as "the period beginning at one o'clock, Greenwich mean time, in the morning of the last Sunday in March and ending at one o'clock, Greenwich mean time, in the morning of the last Sunday in October."
This is actually the standardised, Europe-wide definition of summer time, which is followed by all EU nations. Prior to 2002, the UK had various different start and end dates over the years.
That's correct, with BST in the Summer. It can get confusing when working with people from different countries who aren't aware of BST and who schedule meetings explicitly in GMT, thinking that it automatically includes daylight saving.