I'm completely deaf in my left ear and hard of hearing in my right ear, so I have a problem understanding an English person stood right next to me, let alone someone with a strong foreign accent on the phone.
Based on that, when I had to make a call to BT, I specifically asked for an English speaking, English person within the UK to deal with my issue. I was directed to BT Chat, where I reiterated my deafness and the requirement to speak to an English person. BT chat came back with "Are you able to speak on the phone now", to which I replied yes. I was promptly called ............ by a very Indian sounding person from India.
But, I have a very recent letter from BT in front of me now, stating that 100% of BT call centres are now back in the UK and Ireland. So, if you go back with BT raywilb, you get to speak to someone in the UK ........ not necessarily an English person though.