The new Eurostar service from St Pancras to Amsterdam starts on 4th April offering 2 daily departures at 0831hrs and 1731hrs, the journey will take approx. 3hrs 40 minutes.
On the return journey passengers will need to take a Thalys train from Amsterdam or Rotterdam and change at Brussels Midi/Zuid to pass through security. Brussels offers a choice of up to 10 daily departures to London.
Eurostar are hoping this is only temporary and the UK and Netherlands Governments are working to find an agreement that will allow for travellers to pass through security checks prior to departure from the Netherlands.