That's the only thing that actually matters, everything else you wrote is just the usual nonsense you routinely post
Please provide the letter itself or provide the precise reference or file number where we can locate and access the letter. If the record copying team at the National Archives is to be trusted, the alleged letter is not archived under file number DO 142/476 at Kew Gardens, as stated in OP.
If you are unable to fulfill either of these requests, then we can consider this discussion concluded.
Trust me, I already consider the conversation finished. You are clearly a waster of my precious time.
I will post the letter here fully for the regular readers. After I resolve the small case of obtaining digital rights to do so. Waiting on that.