Ireland is roughly a minute behind England although England and Ireland follow Greenwich Mean Time. During the summer, Western European Summer Time is invoked. Irish Standard Time (Am Caighdeánach na hÉireann) or ACE, similar to British Summer Time (BST), starts on the last Sunday of March and ends on the last Sunday of October; the timing of ACE/BST is in accordance with the 9th EC directive.
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There is no time difference between the UK (London) and Portugal (Lisbon) at any time of year.
Both the UK and Portugal observe Western European Time (WET), also referred to as GMT (Greenwich Mean Time) from the last Sunday in October until the last Saturday in March.
From the first Sunday in March to the last Saturday in October, both countries observe Western European Summer Time, called British Summer Time in the UK. This is GMT + 1
Most of the Caribbean Islands are on UTC - 4 hrs. all year, but some islands are on UTC - 5 hrs. all year and some islands are on UTC - 5 hrs. part of the year and UTC - 4 hrs. the rest of the year. That puts England 4 to 6 hrs. ahead depending on the island and the time of year.
When Europe is on Summer Time, from the last Sunday of March to the last Sunday of October, England is 5 hours ahead of Grenada.
When Europe is on Standard Time, England is 4 hours ahead of Grenada.
Example: When the time in Grenada is 9 AM AST, the time in England is either 1 PM GMT or 2 PM BST.
Madeira follows the same time zone as the UK, which is Greenwich Mean Time (GMT) or Western European Time (WET). As a result, there is no time difference between Madeira and the UK.
In May, there is a 6-hour time difference between the UK and Texas. Texas is typically 6 hours behind the UK.
The time difference between South Africa and the UK is generally 2 hours during the UK summer time when the clocks go forward, and 1 hour during the UK winter time when the clocks go back.
The time difference between Niagara Falls, Canada, and the UK is usually 5 hours. However, this can vary depending on daylight saving time changes in each location.
In November, both the UK and France are in the same time zone (GMT+1 or Central European Time). There is no time difference between the two countries during that time of the year.
There is no time difference between the UK and Heathrow as Heathrow is located in London, which is in the UK. Both locations operate on the same standard time zone, Greenwich Mean Time (GMT) or British Summer Time (BST) during daylight saving time.