Janet Tweedy wrote:

Living near 'Bekonsfield' I gave up years ago saying it as though a
beacon
We also have Chesham Bois and as Sacha says everyone pronounces it Boys!
However there's going to be a Time team programme on Bois House in the
next month and maybe we'll learn what we should call it from that!

Depending upon who you talk to, St Austell in Cornwall, is Snozzle,
Sun-Ozzle or Sane-Ossle. I play safe and say "Sun-Ostel" and it's
never caused a raised eyebrow. Likewise Launceston, which seems to
divide its time between being Laansten and Lawnston. Not being
related to or well-acquainted with Denzil Penworthy, I'm never quite
sure what to say.

There's a bit of a division here in Devon as well. Totnes is
variously Totnus (said quickly with no emphasis) or more commonly Tot-
Ness. I'm assured by a pal who is from an old Tonesian family that
Totnus is used by true local and that Tot-Ness is used by outsiders.