From here:

Take a word meaning “all” and add it to a word meaning “mess” and you have Britain’s word of the year, as chosen by the Oxford University Press: omnishambles.

It’s a noun, informal, that refers to “a situation that has been comprehensively mismanaged, characterized by a string of blunders and miscalculations,” according to the lexicographers.

It’s a word with which Archbishop Justin Welby should familiarise himself as soon as possible.