The collection is free, and has been open to the public since 1874. It houses a range of timepieces dating mainly from the 17th to 19th Centuries.
Relaunched in 2002, the museum tells the history of clockmaking in London, and also includes some modern clocks to demonstrate the art in the modern day. It might not be your sort of thing, but your author trusts his grandmother, who says it is worth a visit.
The Museum is open from Monday to Saturday, 9.30am until 4.30pm, though access is briefly limited during clock winding times. For more information, click here.