There are a few which is typical in the UKat the moment, who think it was a publicity stunt. He is a father and knows a simple letter on headed note paper will make all the difference to the boy. It was his family who released it to the press.
Amazing that there are always a few (the ones who see spaceships every morning) who moan and criticise, and usually politial. I am not political, but thats exactly what I would have said to my kids if a pandemic had hit. Mind you both mine are in their 40's now lol!
At least the Inky spider wrote back and signed it!!!