In message , Dave Arquati
writes

Waterloo to King's Cross isn't terrible - if it's done via the
cross-platform interchange at Oxford Circus.

No, but the point is that there will now be three interchanges each way
where there is now only one.

Six interchanges on a return trip to the continent where there are now
only two.

I fear this will be a big disincentive to use Eurostar.

However, it's not the most obvious route (which I reckon, from the tube
map, looks like via Leicester Square). Perhaps they should put up
really big signs at Waterloo...

For SWT services that stop at Vauxhall, the Victoria line to King's
Cross will be a better bet - but the interchange at Vauxhall, with
luggage, in the rush hour, is an abomination.

--
Paul Terry