Does the time difference between Amsterdam and London change during the year?

No. The gap stays at 1h all year.

When is the best time to call London from Amsterdam?

Between 10:00 and 17:00 in Amsterdam, which is 09:00 to 16:00 in London.

Amsterdam is 1h ahead of London. This gap is the same all year — neither city shifts its clocks relative to the other.

Amsterdam

Netherlands

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London

United Kingdom

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A 9-to-5 day in each city overlaps for 7h. That is 10:00–17:00 in Amsterdam, which is 09:00–16:00 in London.

City	Time zone	UTC offset
Amsterdam · Netherlands	Europe/Amsterdam	UTC+2
London · United Kingdom	Europe/London	UTC+1

What is the time difference between Amsterdam and London?: Amsterdam is 1h ahead of London. This gap is the same all year — neither city shifts its clocks relative to the other.
Does the time difference between Amsterdam and London change during the year?: No. The gap stays at 1h all year.
When is the best time to call London from Amsterdam?: Between 10:00 and 17:00 in Amsterdam, which is 09:00 to 16:00 in London.