This is optimistic.  I think they would last a few days. 🤣

"The report’s topline findings are blunt. The Ukraine proxy war “has exposed fundamental weaknesses” in the “military strength” of both Britain and NATO. In London particularly, the conflict “has raised serious questions regarding the preparedness of government, society and the defence industrial base to support conventional warfighting at scale.” Put simply, the British have no “coherent model” for augmenting their “small” armed forces, with “capabilities needed to sustain or deter warfighting”. In an all-out hot war, their military would last weeks at most."