Got this flyer through a book
"COVID-19 has affected us all including the operation of our warehouse, which has delayed your order. We deeply apologise for this disruption and thank you for your patience.
As a token for our gratitude, we'll cover the cost of shipping on your next order. Just use the code STAYSAFE at checkout*
*Free shipping offer available from May 1st 2020 to July 31st 2020."
Seems like a generic code although this seems to indicate only 1 order