In message .com,
" writes

BARONS COURT / Barons Court (not so much an anomaly as simply both
being wrong, with the absence of an apostrophe)
PARSONS GREEN / Parsons Green (ditto)

Most place names are far older than the apostrophe, which was a
16th-century invention. For instance, Parsons Green never appears with
an apostrophe on old maps or other documents, even well after the 16th
century.

It is the rather haphazard modernisation of spellings over the years
that has resulted in many of the anomalous uses of apostrophes.

But Barons Court is an exception - it was a name invented just over 100
years ago. It didn't have an apostrophe then, and there is no real
reason to add one now.

--
Paul Terry