The time zone used in the British/Irish Isles is shared with or close to a fair bynch of other countries, so there's no rerason to think of this in parochiaol terms:

Here is a list of countries that have much the same time:

In the same time zone:
England
Wales
Ireland
Isle of Man
Scotland
Channel Isles
Portugal
Iceland
Morocco

1 hr behind:
Azores,
Cape Verde Islands

1 hr ahead:
France
Germany
The Netherlands
Belgium
Austria
Spain
Italy
Switzerland
Sweden
Norway