Bruce VK2EM dropped me the following direct e-mail, which may be of interest to those taking part in the VK-EU S2S event.
I only do JT-65 from my unit here in Forster (stealth antennas, QRP, etc) and in the last few weeks I have noticed that there has been a migration to 40M, after our sunset. There have been some very big signals from Europe, and the Americas.
_ _It might be worth, for your activations, checking 40M if you can, and alerting other SOTA people to do likewise.__
So given that after the LP window closes with Sunset in Australia at I'm guessing around 0900-0930 UTC it might be a good idea to switch to Short Path on 40m to look for contacts into VK/ZL (chasers or any brave soul camping into the dark on a summit) from EU. There's a good chance that several of us will switch to 40m for inter-Europe S2S contacts after the LP closes in any case.
Thanks for the heads-up Bruce.