What now for Rishi Sunak?

So what does the future hold for Rishi Sunak as he starts the process of becoming a premier emeritus, a former prime minister who no longer holds government or party office?

In After Number 10 Former Prime Ministers in British Politics, published in 2010, Professor Kevin Theakston identified five themes. 

First, back in government office after being prime minister. If this will ever be relevant to Sunak, it seems a long way off right now.

Second, health and age factors. Theakston identified longevity and good health as being essential to a successful post-premiership. It seems that Sunak has both ahead of him.

Third, honours. Sunak's Dissolution Honours have already been announced. Will he also issue Resignation Honours? And which honours will he have bestowed on him, in time? The Garter (on which there remains a backlog, the last former prime minister to be awarded it being Tony Blair)? A peerage? 

Fourth, putting pen to paper. Will Sunak write his memoirs? Or other books, like some former prime ministers have?

Fifth, money matters. Sunak will keep a car as a former prime minister and police protection. He will also, once no longer Leader of the Opposition, be able to claim the Public Duties Cost Allowance. This was introduced in 1991 following Margaret Thatcher's resignation. Beyond that, how will he earn a living?

There are also other themes relevant to the lives of former prime ministers not identified by Theakston. In our study of Margaret Thatcher's life after Downing Street, we have identified another four.

First, institutional infrastructure. Margaret Thatcher set up the Margaret Thatcher Foundation. It is a model followed, in varying ways, by Tony Blair. Will Sunak do something similar?

Second, birthdays and personal anniversaries. For example, Margaret Thatcher's 70th, 75th, 80th, and 85th birthdays were all marked. So were anniversaries from her career, including her election as Conservative leader, appointment as Prime Minister, and resignation.

Third, political anniversaries. Margaret Thatcher, for example, marked the 10th, 15th, 20th, and 25th anniversaries of the Falklands War. 

Fourth, explaining themselves. Former prime ministers often spend part of their post-premiership explaining their decisions as prime minister and sometimes also from earlier in their career too.

Which of these themes will feature in Sunak's ex-prime ministership, and to what extent? And will there be innovations from his time as a premier emeritus?