Double manned vehicle and daily rest

Found it under the DVSA bit on the gov.uk website

Organising drivers’ duties in such a fashion enables a crew’s duties to be spread over 21 hours however where a driver utilises the multi-manning daily rest concession (of 9 hours rest in a 30 hour period) that rest period cannot be counted as a regular daily rest as it is of less than 11 hours duration. These rest periods therefore count towards the limit of 3 reduced rest periods between any 2 consecutive weekly rest period.

So I do need to take at least one 11hrs rest period.