As the UK doesn't have a written constitution, it really isn't true that MPs only represent their parties.
They are free to change parties, as Winston Churchill did from Conservative to Liberal and back to Conservative. As a Conservative MP, he frequently rebelled and voted against his own party.
Churchill only became Prime Minister because Attlee refused to serve in a government headed by Chamberlain, so a compromise PM was sought.
Nobody ever voted for the wartime coalition government. A number of the leading figures weren't even MPs, but were members of the House of Lords.
I'm afraid talk about what's constitutional or not is nonsensical.
Trump wants to call the Straits of Hormuz ‘Trump Straits’ 🙄
Items we apparently need because of El Nino this winter

