The UK AOSB is failing more candidates then ever before. Candidates are also scrutinised closely at the officer academy (Royal Military Academy Sandhurst - RMAS), especially those aspiring to the combat arms.

Royal Marines officers also had to undertake the Admiralty Interview Board (AIB) in addition to POC, although I am not sure if this is still the case.

The general consensus is that the UK officer selection procedure is providing both the number and quality of officers required - that at least is the opinion of commanders. Most debate within the UK army at the moment is less on officer selection and more on officer training and development; namely the RMAS syllabus and the tactics used in the field exercises there, as well as special to arm training (Basic Officers Course in the US terminology) after officer training.

I will see if I can get some hard statistics on AOSB pass/fail rates and those for RMAS.