Eurostar 20% off 20/06-22/09, book by 13/06

YC wrote:

Can’t get it to work for dates in August (long weekend)… Anyway of knowing which trains these apply to?

*The 20% discount applies to Standard and
Standard Premier tickets (one way or return) from/to
London St Pancras International, Paris Gare du
Nord, Lille Europe, Brussels-Midi, Rotterdam-
Central or Amsterdam-Centraal. Offer valid for
bookings made from 09h00 GMT on 07/06/2022
until 23h00 GMT on 13/06/2022, for travel between
20/06/2022 and 22/09/2022 inclusive, excluding the
following dates: from 13/07/2022 to 17/07/2022
inclusive, from 22/07/2022 to 24/07/2022 inclusive,
from 26/08/2022 to 29/08/2022 inclusive*

Tried to use the discount code yesterday – all 10,000 seats offered have now been taken up