Despite the date limit on the email, I'm not aware of a single case during covid where they've raised issues because of delays. (Family sponsorship anyway )I hope their "acknowledgement of receivement" is not the date they replied to my email, Cuz I technically did the Medical within 7 days after the MR, not 45 days lol.
They know there are issues with clinics themselves and the medicals getting approved internally.
Still hest to write but they do not seem to be 'punishing' anyone with delays die to covid esp after submitted.