Here is the link to book online http://www.ramsgatetunnels.org/ and what it says is.
Tours are up to 1.25 kilometres and will last for approximately 1 hour. You will be accompanied by a guide throughout.
Hard hats must be worn and personal lighting must be carried in the Air Raid Tunnels. These will be provided at the start of your tour.
Sensible footwear is recommended, (flat shoes, boots). High heals are not permitted.
The tunnels are at a constant temperature of around 11 degrees Celsius; they may appear cold in summer but warm in winter
Children 3 - 7 years are admitted free at the discretion of the guides.
Pushchairs and wheelchairs may be difficult to operate and are admitted at the guide’s discretion.
Photography is only permitted in the lit areas of the system
With the exception of Guide Dogs, animals are not permitted in the tunnels
Child 7 - 11 years
maximum 2 per adult
Junior 12 - 16 years
Advanced booking is strongly recommended but tickets can be obtained at the tunnels subject to availability.
Here is the link to the book we publish about the tunnels http://www.michaelsbookshop.com/catalogue/the_ramsgate_tunnels__main_line_public_airraid_shelter___scenic_railway__.htm
And here a map of the tunnels, which should get big enough to read if you click on it