Guys, your visa (or counterfoil) may be stamped anywhere in the world. VFS or VACs are only responsible for transmitting your passport(s) to IRCC. If you check your passport request letter, it didn't say you MUST submit to Lagos or Accra VAC. The originator of the email only advised you to pls note that there may be delays in certain VACs because of number of requests and the fact that COVID-19 has affected staff strength.
I will strongly advise that you do not quote me. This is my personal opinion and not that of any VAC or IRCC. So, if you choose to take the risk of sending your passport(s) to whether London/ Singapore/ S.A. VFS center, the choice is entirely yours. Make sure you do your findings, get the facts right, avoid speculation or hear-say (especially from online portals) and if in doubt, find out from IRCC.
Shalom...