On 9 Apr 2015, at 20:59, Peter Ilieve <peter@aldie.co.uk> wrote:

Remember that we are descriptive rather than prescriptive. I can’t
speak for the Irish, but you would have a hard job trying to get
GMT and BST (another ambiguous abbreviation signifying UTC+1)
changed to GBT and GBST or GBDT.

The British are emotionally attached to GMT :)

We’ve been using GMT and BST for as long as I can remember, I’m pretty sure the abbreviations were in wide usage before computers were used as clocks. (I know that as a child we talked about "Winter Time" and "Summer Time” but I don’t recall ever seeing that written, but we’re talking about a long time ago.)

jch