I believe yes, Bangladesh as a commonwealth country is free to let it's citizens join the British army, but you would have to be able to speak engish as well as a local. Tier 4 would make you 16-20ish , right? The minimum age to enrol is 15.9 years old, but you are unlikely to be deployed anywhere until you are 18. So almost certainly, yes. I would like to thank you for wanting to help defend our country.
Edit: Sean, well, it's nice to think the best of him! Personally i wouldn't want to join someone else's army during a time of war, whatever they paid me.
