Having a warrant in your name?

I am panicking now. Was meant to be at a recent court case for a Driving offence. Well i ended up with Gastrointeritis so I phoned to let them know

Today I had a letter for a warrant for my arrest.

If I go to the police station will they keep me in or will they arrange another court date? As I did contact the courts and told them I would not be able to attend
Having a warrant in your name?
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