Robin, Goldfinch and Siskin

At one stage, 6 Fledgeling Goldfinch, Robin and Siskins. Extra. found this Giles cartoon sent to Ced's Mum who was an Auxiliary nurse on a private ward, where Giles had been a patient, at Anglesey Road Ipswich hospital in 1960s. Even the envelope from Daily Express. Wondering if it's worth anything, although it was given to Grace  personally as she nursed him!