that the snobbish Received Pronunciation (RP) in British English
began (so confusingly, regrettably) to lose the final and pre-consonantal R
(as in garner which now sounds the same as Ghana,
father which now sounds the same as farther,
stork which now sounds the same as stalk...
and drawer which now sounds the same as draw)
only at the end of the 19th century (though the R persisted
among some in the Upper Classes until the end of World War One).
RP is spoken mainly in central and south-east England,
so the R remains especially and unbroken
in Scotland, Ireland, rural Wales and Western England -
and of course most other parts of the world where English is spoken.
(It is common for both final consonants and final vowels to be dropped over time:
e.g. final R in French and Icelandic, final I in Romanian, etc., but it is rare
for the medial R to disappear.)