Is a judge in the political field?

Answer 1

No- a judge's job is to uphold the law and to pass sentence (or not, as the case may be) with complete impartiality. The laws that he or she may have to uphold are passed by political consensus- but this does not mean that the judge in question may agree with them. They thus have to balance their own knowledge of what is basically, humanly right with what the law decrees, and pass sentence in accordance with these two factors. It's a tricky balancing act.

The most senior judges can hold seats in the House of Lords, but not because they have alliegance to any political party- simply because their jobs have given them insights into wisdom, social knowledge and the way the world works.