Sorry I think your arguments are weak:
The UK MOD has Nationality requirements which restrict non Brits from joining the armed forces
Not quite. Also Commonwealth citizens and Irish Republic nationals are permitted to join.
The UK MOD until recently restricted the employment of homosexual people
How do you define recently? It was 2000 which is 11 years ago.
The UK MOD until recently restricted the ... employment of women in many job categories.
Again, how do you define recently? There were female pilots training in 1990, which is 21 years ago. After opening the aircrew trades (women were employed as AQM/ALM for many years prior to 1990), Firefighter and Aerial Erector, only RAF Regiment remains a closed restricted 'job category'.