Strictly speaking, in capability terms, there is no such thing as an MPA capability. What is required is a platform that can conduct 'Sea Surveillance', 'ASW' and 'ASuW' with the ability to carry out SAR as and when needed. An MPA platform may be able to fulfil most, if not all, of those functions. Bit of pedantry I know but that is how our capability planners would describe it.