Thank you Orange

But apparently my businees is important to them.

The last component is in place

We are taking a short holiday to Spain. By train.  That nice man at Seat 61 has plenty of ideas and route information for low-carbon journeys by rail, so Spain seemed like a nice option.

Eurostar to Paris,

Sleeper to Madrid,

train to Granada,

Sleeper to Barcelona,

Sleeper to Paris,

Eurostar back to London.

Three nights on board the Trenhotel will be augmented by "normal" hotels in Madrid and Granada.  The journey will (hopefully) be as much part of the holiday as the destination.

We'll see.