A domain will go into Redemption if payment has not been made 30 days after the renewal date.  While in Redemption, there is a fee to remove it of approx €100 + VAT.  The domain will remain in Redemption for 30 days, if no payment has been made to remove from Redemption, the domain will then enter the Pending Delete phase.  While in Pending Delete it will not be possible at all to renew it.  The domain will remain in Pending Delete for 10 days.  After this time, the domain will become available to anyone to register again.