Here are the totals of the top three for the last three months.

Rees Mogg: 21 per cent this month, then 21 per cent and 18 per cent.

Gove: 16 per cent this month, then 16 per cent and 14 per cent.

Johnson: 13 per cent this month, then 14 per cent and 12 per cent.

Our findings seem to be stuck in this groove, for better or worse, at least for the time being.

Meanwhile, 51 per cent of respondents believe that Theresa May should resign as Party leader before the next election – a reminder that our Next Tory Leader question is not exactly academic.  Thirteen per cent think she should quit now; 34 per cent that she should lead the Conservatives into the 2022 contest (or earlier). Full result below.