Originally Posted by
MSPeconomist
If you want to do the Eurostar in one direction, think about the implications for LHR departure tax. If you train to London and then fly TATL, you will be hit with a lot of tax versus starting from most other places and just connecting in London.
There's an excellent thread that carefully explains all of the issues.
Actually, the tax for flying LHR-CDG is miniscule: £12 in Y and £24 in J. Same applies for any flight departing the UK for which the distance between London and that country's capital (not the flight distance!) is 2,000 miles or less. (I guess that makes flying from the UK to far east Russia a heck of a deal in terms of taxes.)