You'll have to excuse my ignorance as I've never booked European rail travel before. I'm taking the family to Europe this summer and I'm looking at taking the Eurostar from Paris to London on the 6th of July, one-way. When looking for tickets on the Eurostar website it's quoting me EUR 245.00 each. I just about fell out of my chair! Perhaps it's my ignorance here, but that seems exorbitant. Unfortunately hotels and airbnb bookings are already set, so dates are not flexible.

Can anyone offer some advice on getting cheaper tickets or am I stuck paying what they're asking?