"Unless we have paid in full the accrued and unpaid interest on the Securities
• in respect of each of the immediately preceding four consecutive Interest Periods, or
• if four Interest Periods have not occurred since the Securities were issued, since the issue date,
we will not recommend to our shareholders, and to the fullest extent permitted by applicable law will otherwise act to prevent, any action that would constitute a Mandatory Payment Event or a Mandatory Partial Payment Event.
If a Mandatory Payment Event occurs then, except as described in the next paragraph, the accrued and unpaid
interest payable on the Securities on each of the immediately succeeding four consecutive interest payment dates will be mandatorily due and payable in full on those interest payment dates, notwithstanding that any Deferral Notice has been given by us in relation to such accrued and unpaid interest or the occurrence or continuance of any Required Deferral Condition (other than a Required Deferral Condition that occurs after the occurrence of the relevant Mandatory Payment Event, in which case such accrued and unpaid interest shall not be due and payable). We are not required to pay any deferred interest upon a Mandatory Payment Event."
( See page S-18 424B5)
This is not the best stopper provision that I have seen, since it allows for a cure going back only for 4 quarterly payments.