Originally Posted by BAAZ

I don't think so, at least not since they changed the basis of points crediting.

You used to get points credited when you made the reservation, so the system would think that you had the necessary points when you applied, so you would apply, and then cancel the reservation and get a refund.

Now, you only get points credited when you actually make the trip (as with airlines). So I expect that the system will only let you apply after you have made the qualifying journey ("you need to have made at least one trip with Eurostar in the last three months worth £250 or more").