I spoke to someone in customer service this morning - in typical "my luck" fashion, it seems that a TA must have had a block of seats held or something like that, which then got released - the price on the regular tickets is now down to 57 GBP (cheaper than I was ever seeing in the past few days), and it is now saying limited number of SP seats. So I went from 79 GBP, to 89.50 GBP, to 57 GBP in a span of 4 days.
The agent told me that our August 18 London - Paris leg wouldn't be available online until February 19. He used some date calculator that automatically works out the 180 point for them. Are you saying that you were told that date may actually be released on Jan 22? I had a reminder set in my phone to get online first thing on the 19th, but now I'm wondering if I should be watching on the 22nd?
I hope that getting on the train and the actual journey are less confusing than the booking process!