Eurostar's fare structure seems to include some surprising oddities. The starting fare for a London - Paris/Brussels/Calais/Lille return is £69 on the UK site yet only 75 on the French site (only around £62.50 using an official EUR - GBP exchange rate, maybe £64/£65 with a bank exchange rate). The same fare for Paris/Brussels/Calais/Lille - London is £80 on the UK site and 88 on the French site (also significantly less than £80). Firstly, why are the fares in euros lower and secondly, why are journeys starting in London cheaper? One-way fares starting in Paris are also more expensive than one-way journeys starting in London. These differences also seem to apply to all fare categories as far as I can see, not just the starting fares. Can anyone enlighten me?