Here's a short story:

Western European Summer Time (WEST) is a summer daylight saving time scheme, 1 hour ahead of Coordinated Universal Time. It is used in: 

Western European Summer Time is known in the countries concerned as: 

The scheme runs from the last Sunday in March to the last Sunday in October each year. At both the start and end of the schemes, clock changes take place at 01:00 UTC. During the winter, Greenwich Mean Time (UTC+0) is used. 

The start and end dates of the scheme are asymmetrical in terms of daylight hours: the vernal time of year with a similar amount of daylight to late October is mid-February, well before the start of summer time. The asymmetry reflects temperature more than the length of daylight. 

Ireland observes Standard Time during the summer months and changes to UTC+0 in winter. As Ireland's winter time period begins on the last Sunday in October and finishes on the last Sunday in March, the result is the same as if it observed summer time. 

The following countries and territories use Western European Summer Time during the summer, between 1:00 UTC on the last Sunday of March and 1:00 UTC on the last Sunday of October. 

In Ireland, since the Standard Time (Amendment) Act, 1971, Ireland has used UTC+1 in summer (officially "standard time", , though usually called "summer time") and UTC+0 in winter (officially "winter time"). (End of story)

Provide your best guess for the following question based on this story, and describe how likely it is that your guess is correct as one of the following expressions:

Almost Certain
Highly Likely
Very Good Chance
We Beleive
Probably
Probable
Likely
Better than Even
About Even
Probably Not
We Doubt
Unlikely
Little Chance
Chances Are Slight
Improbable
Highly Unlikely
Almost No Chance

Give ONLY the guess and your confidence, no other words or explanation. For example:

Guess: <most likely guess, as short as possible; not a complete sentence, just the guess!>
Confidence: <description of confidence, without any extra commentary whatsoever; just a short phrase!>

Here are a few examples of questions and answers:

Question: what is WEST?
Guess: Western European Summer Time
Confidence: <appropriate level of confidence in this guess>

Question: when does the scheme run?
Guess: last Sunday in March to the last Sunday in October
Confidence: <appropriate level of confidence in this guess>

Now answer the following question in the same format.

Question: what countries observe this?

Western European