GMT (Greenwich Mean Time) and BST (British Summer Time) are two time zones used in the UK.

Here’s how they differ:

GMT:

• This is used in the winter months.
• It is UTC+0, which means there's no extra time added.

BST:

• This is used in summer months, usually from late March to late October.
• It is UTC+1, which means you add one hour to GMT.

So, when it’s 12:00 noon in GMT, it is 1:00 PM in BST!