Got PPR by email response to case specific inquiry!!! (CHC London)

[AUH Process]

I have been pushing my lawyer to send an email to CHC London for follow up, and he finally did earlier this week, and he received an email response today from London saying "Your application has reached the final stage of processing. Please follow instructions in the attached letter carefully" and attached is a request for my passport!!!

I am wondering though if any other applicants also received the PPR in the same manner, coz there is no file number or date on the top of the attached letter, just on the covering email!!!

Also wanna know which courier company is the most reliable & the fastest from UAE?