High Court Judge

A Justice of the High Court, commonly known as a ‘High Court judge’, is a judge of the High Court of Justice of England and Wales, and represents the third highest level of judge in the courts of England and Wales. High Court judges are referred to as puisne (pronounced puny) judges. High Court Judges wear red and black robes.

Upon appointment all High Court judges are knighted (usually as a Knight Bachelor), or in the case of female judges made Dames Commander of the Order of the British Empire. So, for example, Nigel Bridge became Sir Nigel Bridge and Brenda Hale became Dame Brenda Hale DBE.

In court, a High Court judge is referred to as My Lord or Your Lordship if male, or as My Lady or Your Ladyship if female. High Court judges use the title in office of Mr Justice for men or, normally, Mrs Justice for women, even if unmarried. When, however, Dame Alison Russell was appointed in 2014, she took the title "Ms Justice Russell". The style of The Honourable (or The Hon) is also used during office. For example, Sir Joseph Bloggs would be referred to as The Hon Mr Justice Bloggs Kt. and Dame Jane Bloggs DBE as The Hon Mrs Justice Bloggs DBE, for as long as they continue to hold office. When there is already or has until recently been a judge with the same (or a confusingly similar) surname as a new appointee, the new judge will often use a first name as part of his or her official title. Many judges have done this, such as Mr Justice Christopher Clarke (Sir Christopher Simon Courternay Stephenson Clarke) and Mr Justice Roderick Evans (Sir David Roderick Evans).

...
Wikipedia