1. Be referred to as 'Kate'
When Kate Middleton joins the House of Windsor this year, her official title will become 'Her Royal Highness the Princess William of Wales'.
She can be addressed as 'Catherine' or 'Ma'am' (pronounced like 'ham'). But 'Kate' isn't going to cut it anymore by Royal standards.
Clarence House officials will probably wine and dine London's Royal correspondents and then ask them to please refer to Kate as 'Catherine' in the future. But we think they will refuse to do this. Something to do with search engine keywords.
Technically, the Queen and other members of her family are allowed to vote, but they do not do so because in practice it would be considered unconstitutional and not in accordance with the need for neutrality.
This is in keeping with the Royal Family's public role, which is based on identifying with every section of society, including minorities and special interest groups.
3. Run for political office
For the reasons stated above, this is also a no no.
4. Escape the scrutiny