Ian Jelf wrote:

Meantime, I am sure I already mentioned the pronunciation reported to
me by someone I believe, by a tourist wanting to go to Inga-testony.
(The implausible bit is that someone wanted to go there.)

Real ones (ie to me, in 18+ years in tourism), complete with the reasons
"tourists" might want to go to sometimes unlikely places):

Neck-ells (Nechells area of Birmingham. To get to the "Star City"
complex))

Sluff (Slough, as they;d been told to get a bus from Heathrow with that
destination, in order to reach an hotel)

Edin - burrow (Edinburgh, as almost *always* pronounced by North
Americans)

Not quite a place name but an American lady living in Britain on a tour
of mine once said she caused amusement among her new British friends by
always calling Sainsbury's "Sains - berry"; apparently they ended up
calling it that, too!

sure there have been more.

Was in London decades ago and got in a taxi wantong to go to St
Mary-le-Bow Church in the City. Taxi driver responded, "that's the one
just off Key Apsiddy, innit?"

--
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(43 015 at Wolverhampton, 4 Oct 1987)