Source: http://transact.westminster.gov.uk.City of Westminster. License: All Rights Reserved.

The Apple Garamond for the wordmark, because the eye of the lower-case 'e' is smaller than other versions of Garamond that you can buy today (including ITC Garamond Narrow).

However, Florian Hardwig, has confirmed to me after time of press that the typeface is indeed ITC Garamond, only 78% narrower so that it appears like Apple Garamond, which can be confusing for the untrained eye. See comment below.