The fact Starmer won’t even think about joining the single market is stupid too.
Joining the single market would simplify border issues but it wouldn’t solve them… We’d have to join the Customs Union and the common VAT area as well to do that. SM-only is not completely pointless but there is a massive political risk attached because it doesn’t solve all the problems its advocates pretend it does.
There are only two ways to make Brexit work. One is to be an EU member in all but name (following all the rules but having a very limited role in making the rules). The other is a united Ireland (with a lot more expenditure on customs and warehousing in Britain).
The first is politically impossible, and also pointless. The second is up to the people of the island of Ireland and requires a British govt which is willing to invest in the real economy, rather than keeping most of us around to create the illusion of a real country instead of a tax haven based on a massive casino.