The ‘high trust' model of the tri-borough was based on value for money, respect for shared learning, innovation, collaboration and, most of all, strategic leadership that sees beyond its own small world.

But the new Hammersmith & Fulham LBC Labour administration – which announced in its manifesto that ‘tri-borough is dead' – disliked the arrangement so much chief officers had to move from celebrating and promoting the model to protecting and defending it. Sadly ‘Trexit' won and the leadership of Westminster City Council and Kensington and Chelsea RLBC was disappointed.