hi filipina owl!
i believe the submission of documents is on the VFS office in AXA Building Makati not the British Embassy in Taguig.
BDO has mall branches which are open even on Saturdays and Sundays. You can still try and you can pay over the counter by cash. As for the manager's check, the bank you have account with issues this.
What's the holiday on Monday? I'm sorry I am not aware.
Hope that helps.
