To use my second name rather than my first?

One of my brothers was always called his second name. Parents wanted it to be his first but then the initials would not have read well.

DS3 was always called by a diminutive of his name and when he was 18 decided to change it. All he did was apply for a new passport and included a letter I had written as an explanation and it was done. Legally you don't need a deedpoll, just need to be in common use.

Ask to speak to the practice manager to explain.

Needless red tape it seems to me.

Reminds me of my two uncles, one was called Albert William and the other William Albert (my grandparents obviously not that imaginative!). The one named Albert was known as Bill and the one named William was known as Albert - I have never been able to work that one out