Folks,
There is a UAE AIC which states that no delay means upto 20 mins delay, same as the UK. Since it is written down and you are aware of it before departure, it CANNOT be part of your contingency which is for
unforseen circumstances.
To my mind, that means you are rightly entitled to have 20 mins fuel over and above min reserve + dest'n alt + contingency planned at dest'n when you depart.
Personally, I look at the dest'n weather, time of day, enroute weather, whose FIRs and the amount of contingency I've been given. 600 kg at midnight or 06:00 is not enough.
Sensible additions seem to be acceptable, no letter for me so far
At the end (or beginning) of the day, if you can reasonably justify the extra, throw the letter in the bin.
Either way, both are not required as we often have 20 mins anyway by having a destination alternate
HTC, I disagree.