FYI Eurostar now charges £5 for telephone bookings

http://www.eurostar.com/UK/uk/leisur...ns_answers.jsp

For bookings made over the telephone or to make a booking over the telephone.
Call 08705 186 186 or from outside the UK 0044 1233 617 575
from 8am to 9pm Monday to Friday
from 8am to 8pm Saturday
from 9am to 5pm Sunday
Please note that a £5 booking fee applies to all telephone bookings.