PHPSESSID: Used to store information for this visit only (mostly booking information)

spymissions_cookieprefs: Used to record your cookie preferences

spymissionscouk_user: A random unique user id we assign to track information about what pages you looked at etc

_ga and _ga_ZBXWFTP7Y0: Google Analytics

_gcl_*: Used to track conversions (whether or not someone booked a SpyMission) from clicking on an advert on Google