"because Britain has two distict Celtic language groups. "
Interstingly enough, P Celtic and Q celtic are governed by the shape of the head, more specifically, the soft palate.
The glottal stop as in "loch" is nearly impossible for the Welsh/Brittany group to pronouce due to the shape of their soft palates.
There were the "long headed Celts" and the older "Round headed Celts".
The long heads were more adapted to Q celtic and the round heads P celtic.
That's how "Mac" became "Map" {shortened to 'Ap'] for "son of" as in Ap Lllewllyn or Mab, as in the book of the Mabinogion.
I'm primarily Scots/Irish but physically I'm a throwback to the Welsh in my lines and I cannot manage a glottal stop worth a d@mn.
The Welsh language, however, rolls off my tongue like melted butter.
"The glottal stop as in "loch" is nearly impossible for the Welsh/Brittany group to pronouce due to the shape of their soft palates."
????????????????
Give me a break.
And only people with shovel shaped incisors can properly speak Chinese.