I am a sole trader selling ebooks online. I do not want to use my real name on my website and hoped to use a nom de plume. I know this sounds suspicious, but I wish to safeguard the privacy of my family given my husband’s occupation.
Do I have to reveal my real name and address? Or, could I use an alias and a PO Box address legally?
You do need to provide a name and address to comply with the applicable law.
There are various pieces of legislation that may be relevant.
See in particular:
A PO Box is not normally considered to be a "geographic address".