Suddenly, at election time, political predictions become so much harder and riskier. Everything changes in a campaign, not least the news cycle.

That’s my excuse, at any rate, for failing to foresee the announcement of a general election in last week’s Politics at Jack and Sam’s.

There were a few clues – and one magisterial tweet from Financial Times journalist Lucy Fisher – but we were deaf to the signals.

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In this week’s Politics At Jack and Sam’s podcast, we reflect how this Number 10 – in big contrast to the last two – is much better at keeping secrets.

But the moment an election is called, the way information gets out alters and everything becomes trickier.

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Normally political news emerges in so many different ways. There’s parliament. Government announcements. Questions, written and oral. MPs themselves, including ministers, wandering the corridors of the Commons where journalists can go stopping for a gossip.

All of that disappears at election time. Keeping things secret from the other side matters a lot more, while decisions and information is held by a much tighter group of people.

That’s why it’s not really feasible to do a weekly look ahead political podcast – and we’re responding by going daily. More details to follow.

Rishi Sunak‘s allies are quite upfront that the timing of the general election was a finely balanced argument and you can make a case both ways.

One of the big things that motivated Sunak to go now was that he was doing – in his view – big things; welfare announcements, defence spending commitments, NHS workforce plan.

But they found people weren’t listening and the polls weren’t moving. They weren’t “getting a hearing”. Which they put down to people being switched off from politics and apathy being high – and so the decision to call an election was motivated by that.

The other big consideration was that from around March, early April they were getting internal economic indicators, suggesting the economic conditions – things like inflation, interest rates – might be favourable sufficiently such that they could base a campaign around.

Fascinatingly, they say there wasn’t a “decision” meeting two months ago or even three weeks ago – the move was more like the tide coming in slowly.

Although Labour were caught on the hop – some staff had booked leave, were privately confident there was nothing coming this summer and the Labour campaign bus is not yet ready – candidates claim to be pretty happy with what’s happened so far.

However, the biggest challenge of the next five weeks will be seeing whether they can respond to the pressure of a campaign, and the relentless desire for more of everything.

Currently the narrative is that Sunak had a miserable start – in a few weeks, pictures of the PM in the rain could be a plucky fighter battling against the odds.

This feels unlikely right now, but having been through the 2017 campaign, we know anything can happen.