Turns out you’re in luck.
ETX Capital in the UK (FSC regulated and FSC and FSCS registered). You can get a hold of James Matthewson [James.Matthewson@etxcapital.com] (or Customer Service I suppose) for requirements (2 forms of picture ID and 2 forms of address document).
Your other alternative is Deltastock AD in Bulgaria (EU Passported and MiFID regulated). They require a bank statement with physical address (no PO box) from a bank that is a member of the organizations FATF, APG or Moneyval (all three of which I assume will mean more to you than me).
Bear in mind that at BOTH you’re subject to the ESMA leverage restrictions and you need some pretty decent capital to be able to trade what you’re looking at (unless you’re happy to make a few cents per day that is).
Hope that helps.
I tried a few others for you but sorry: not possible (Oanda, DF Markets in the UK, IG) (pity about DF Markets though to be honest i.e. Deltastock’s sister company in the UK).
There’s probably dozens of others I suppose (but I’d not trust them with YOUR money let alone my own).
Found one thing interesting. One of those at the bottom of the above, I forget which one, will accept Nigerian Citizens that are NOT RESIDENT in Nigeria. I think it was DF Markets. Anyway. When I asked on your behalf I made sure to make it clear that you are a citizen AND a resident.