In message , Bob Wood
writes

The full range of fares to Paris is listed he
http://www.eurostar.com/UK/uk/leisure/travel_information/before_you_go/fares/london_ashford_to_paris.jsp

But remember that there are often Eurostar promotions which offer much
better rates. For instance, the recent Daily Telegraph promotion offered
Paris return (midweek) for TWO people for £58 (£29 each):

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

And there is/was an offer of 2 nights in Paris, Eurostar and hotel, all
for £77 (upwards) per person - possibly still there at:

http://www.eurostar.com/UK/uk/leisure/latest_deals.jsp

--
Paul Terry