We are all, notionally at least, astronomers and invariably use UT to report events we have observed. Predictions of future events, such as are published in the BAA Handbook, are invariably given in UT.
Can those who organize events for a future date and time please explicitly specify the time(s) in UT?
I missed an exoclock meeting because the organizers quoted 16:30GMT when they meant 16:30BST. I was not the only person to do so. Had the time been advertised as 15:30UT all would have been unambiguous.