what is the basic eligibility criteria for applying for phd is it msc or mphill

In the UK most international students are required to have a Masters degree (MSc, MRes or MA) before they can register for an MPhil or a PhD. Although most PhD students will register initially for an MPhil, if they are considered good enough they will be transferred to a PhD after 12-18 months, without ever submitting an MPhil thesis.