Usually a Day off should consist of 2 local nights (8 hours between 2200 an 0800 local time) and cover at least 34 hour.
I Presume this is a Uk based crews roster so 12 Aug would be invalid.
Different airlines have different agreements for re payment of days off. Could be paid for or replaced or if you are lucky both.
Legally it looks like they are missing 2 days off in 14 due 12th being invalid also. If it was me I would of replaced 14th to keep pair. As long as 16th is a zulu report time.
Hope this helps
The Gimp