BB777.... It's a really good question, and the academic status of the ATPL has been discussed previously. Sadly the ATPL has never really achieved status of an academic qualification, likewise and instructor qualification has no status as a teaching qualification outside aviation. This is unlike occupations like nursing, pysiotherapy and radiography are all now all carry degree qualifications.
Having said that I largely agree with daysleeper it will really be down to an individual case by case basis and the department with have to justify the application to the academic register. Having said that, these days universities are in the business of making money and will try to help you.
In your case, it is probably down to how you present both your experience, training and qualifications. I would say you are more likely to get yourself on a MSc course which relates to your past studies, such an MSc in Aviation Management is more likely that a MSc in Chemistry or Mathematics.
Just to clarify, in general terms in respect a Masters, in the UK is either a MSc which is a taught course with exams and a dissertation, and a MPhil is a research degree by Thesis, , although you can request some taught modules in areas you need to strengthen such as statistical analysis or factor analysis.
The way you present your application is important, list every course, exam and the pass marks, which all being above seventy per cent may seem impressive, likewise be prepared to provide a copy of the syllabus.
If yourapplying for a research degree, you really need to put together a good research proposal, this is not easy, and you probably need a mentor to help you with this as there is no set format, it is more like a sales pitch. I can you some pointers if you pm me.
Finally, it is encouraging when people established in their career such as the military or aviation want to further themselves outside their career, it will always give you that edge upon promotion. I can think of a line pilot who did a MSc and ended up as a fleet captain, and another chief pilot and fleet captain who had a PhD. The added benefit is that if for whatever reason you leave aviation, your ATPL will mean nothing to most employers, and these days most half decent jobs require degree qualified people.