Despite the prime meridian crossing the country, Spain is the same timezone as Berlin. One hour more than London.

If you are interested, look for the historical reasons for that.

Edit: OK, a good source.

> On March 16th 1940, the clocks jumped from 23:00h to 00:00h to display the same time as Nazi Germany and other Nazi-occupied countries such as France and the Netherlands. This was an entirely politically motivated move to show support to the fascist government of Germany and showed no consideration for the natural cycle of the sun in Spain. According to the original 24-hour division of the world, Spain’s latitudinal position meant that GMT was the most natural time-zone for it to follow.

From: https://theculturetrip.com/europe/spain/articles/heres-why-s...

Spanish civil war was won by the fascists and Franco's dictatorship followed.