On July 13, 2016, I clapped David Cameron onto Downing Street to make his last speech as PM. Then a few hours later, I clapped Theresa May into No 10 after making her first.

As one of just a handful of David Cameron’s special advisers who stayed on with Theresa May, I had the rare experience of watching a handover between prime ministers from inside No 10.

Now Theresa May’s days in No 10 are numbered and this process will soon repeat. Not long from now, her successor will step into Downing Street for the first time as PM. When they do, they should learn from her mistakes.

Theresa May’s first speech as prime minister set out a vision to help people struggling to get