6. I want to renew, but as a different type of member from last year (e.g. I was a 'joint' member and now I want to be a 'single' member)

This is easy to do, although there is no link from the main page. Sign in to your account (this bit is very important - you must be signed in) then click here  This will take you to the normal sign-up page, but the fact you are logged in will mean the new membership will be associated with your personal account rather than creating a new one