The Octagon Chapel in Milsom Street, Bath, Somerset, England was built in 1767 and has been designated as a Grade II* listed building.

[1] The building was designed as a church by the architect Timothy Lightholder (or Lightoler),[1] whose specific brief was to produce a structure which would be warm, comfortable and well lit.

A gas engine was installed to drive the polishing lathes, work the lift, make the electric light and, by means of a fan, circulate air through every part of the building.

Mallets was described in Drapers Record, 26 December 1908, as 'the most sumptuous shop in Europe, the wares of which include practically priceless curios and treasures of historic association.

[9] In 2004 the local authority, Bath and North East Somerset announced a deal with the L and R Group to convert much of the site to retail and restaurant use but ensure the Grade II* listed building was maintained and improved.