Some of the application items will remain unchanged after C6 has been implemented. If I am being proactive and start collecting some of the documentation are some items fine to be predated prior to the C6 implementation date. For example, if I get the citizenship photographs developed with a date stamp prior to C6 implementation would this example be acceptable or are they fairly strict??
Photographs are valid for 6 months. So you can submit pics as old as this, as long as they do not change current photograph requirement regarding size etc. By the way, they have not changed since 2012. But there is no guarantee they will not change these, so you may end up paying twice. Pictures take 5 minutes at a drug store, not worth being pro-active perhaps.