The UK is set to miss out on the “hottest ever” heat wave in continental Europe this week but the metaphorical temperature at Westminster has further to rise in the final few days of political action before the summer recess.

Both Rishi Sunak and Sir Keir Starmer are heading into a week of strife which is unlikely to leave either of them, or their “troops” in the Commons, feeling better off when it is over. Sunak is in particularly deep water as even more Conservative MPs are behaving like the proverbial frogs and surrendering to their fate. Ben Wallace, the defence secretary, is the latest of some forty-plus colleagues to announce his intention of jumping out of the pan before he’s boiled.