Update 2022-06-16: According to media reports on Thursday (17 June) there will be disruptions in the operation of the Eurostar from London to Brussels, Amsterdam and Paris due to the strikes in the coming week. A detailed overview of cancelled train services can be found in the link below.
Update 2022-06-15: On the strike days, rail services are expected to operate only between 7:30 am and 6:30 pm (local time). Rail services to Penzance, Bournemouth, Swansea, Holyhead, Chester and Blackpool and north of Edinburgh and Glasgow will be completely suspended. At most, a quarter of the usual connections are to be offered. Restrictions are also to be expected from Monday (20 June) to 26 June on days when there is no strike.