What is undoubtedly the case is that there is, again, noisy opposition to the idea.
A petition on Parliament’s website has reached well over a million signatures. Only a handful have cleared that threshold in the last decade.
The prime minister will hope a quieter majority are won over by the idea – and he already has his political dividing line with Reform. And with the Conservatives, Liberal Democrats and Scottish National Party, as it happens.
His challenge, against the toughest of backdrops – economic, political and international – is to prove he can deliver incremental, or better, improvements for voters, and convince enough that the embrace of Reform would be a big mistake.
Sir Keir is now unflinching and explicit, talking of what he calls the “open fight” he wants with Reform – a “battle for the soul of this country”.
On that characterisation of the tussle ahead, at least, Reform agree that is precisely what it amounts to.