I agree it was very well played.
The mirroring of language, the flourishing of the letter, the shoulder patting. I was watching for that actually after seeing Macron deploy it, and spotted Starmer's first shoulder pat as he arrived at the door. Clever.
Maybe slightly overdone thereafter but that would be my only criticism.
Embarrassing but necessary. Kudos to his coaches.
Trump is so unpredictable though. Did anyone else hear him turn to Starmer in the post lunch press conference and bark 'that's enough' as he was answering a question?