My thank-you from the Director-General of the Met Office added, as if an afterthought :
"please feel free to make any comments or suggestions" or words to that effect.
Ridiculous, because all my pithy comments, helpful suggestions, criticisms and general "all for it" contributions had been studiously ignored by all of my line managers for 41 years.
And, no, I don't know where mine is either. It was probably of the "laugh and tear up" variety.