Miles booster offers?

Anyone know when the last offer on Miles Booster was and if any new offer is expected any time soon?

Some time in May looking at my receipt

Code: Select allThank you for boosting your miles with Flying Club. The additional miles that you purchased will credit to your Flying Club account approximately 72 hours after the date of your first flight leg / sector *(or within 72 hours of purchase if purchased post-flight)*. Meanwhile, you’ll see a summary of your purchase below.

Purchase Summary

Confirmation Number:   xxxxxxxxxxxxxxxxxxxxxxx
Purchase Date:   May 15, 2015

The last offer for 20% extra finished on 7th October

Next one should be January with the next reward seat sale