Example - for those with acquired/grandfather dcpc rights
7 hours done on 09/05/2010 = valid until 08/05/2015
7 hours done on 11/12/2011 = valid until 10/12/2016
7 hours done on 08/07/2013 = valid until 07/07/2018
After 09/09/2014 the drive cannot drive LGVs commercially
7 hours done on 11/10/2014 = valid until 10/10/2019
7 hours done on 12/12/2014 - at this point all the others are still valid so the 35 hours are complete and a DQC is issued with an expiry date of 11/12/2019
That driver now has until 11/12/2019 to get the next set of 35 hours if they wish to continue driving commercially after that date
If the driver did all that next set of 35 in the month of January 2015 then a DQC would be issued with an expiry date of 11/12/2024 but no more hours towards the next set of 35 would count until after 11/12/2019