I was born in Perth Scotland to Irish parents who were both native speakers of Ulster dialect Irish (Gaelic). I have lived in Co Donegal, Ireland from the age of two years until I was just past my sixteenth birthday. During this time I spoke Irish (as above) and English in equal measures.
I worked in London from 1988 to 1998 and during that time I had two curious experiences with accent.
The first was when I had recently arrived in London and lived in Walthamstow, a lady at Ilford railway station told me in answer to some enquiry I had made ‘I am afraid I do not understand a word from you’, to which I replied ‘Madam your accent is as foreign to me as mine is to you’.
The other incident concerned a lady who worked in the same building as me and who was from the Isle of Lewis , Scotland but had acquired a passable London accent. When she one day introduced me to her parents who were visiting from Scotland. Her mother said ‘He speaks just like us’ they were Scots Gaidhlig speakers. but we spoke to each other only in English.