Made contact by phone today (by calling the ASGS number +33 4 67 40 76 10) before 0900 local - that semes to be the only time it gets answered) was assured by a M. Bellerose (who is the client manager) that 'regularisation' payments are due in June and August (for Q4 2014 and Q1 2015respectively).
I had previously been told by another contact (a G. Bauchet) that they would be in May/August so at least that is a promise of money to come...
I'm trying to now work out if it is worth invoking a CDP process...