Foreign language starts to influence opinion around part of UK (4)

'foreign language' is the definition.
'igbo' can be an answer for 'language' (I have seen 'Nigerian language ' mean 'igbo' so perhaps 'language' could also mean 'igbo'). I'm unsure of the 'foreign' bit.

'starts to influence opinion around part of uk' is the wordplay.
'starts to' indicates taking the first letters.
'around' indicates putting letters inside.
'part of uk' becomes 'gb' (I can't explain this - if you can you should give a lot more credence to this answer).
The initial letters of 'influence opinion' is 'io'.
'io' enclosing 'gb' is 'IGBO'.

Can you help me to learn more?