As a small child, I collected the picture cards given away in packets of Brook Bond tea; Tunnicliffe's excellent paintings provided the illustrations for the series:
Bird Portraits
British Wildlife
African Wildlife
Tropical Birds
Asian Wildlife
and these encouraged many children in the late 1950s / early 1960s to take an interest in animals.
I too collected these and still have the albums. Tunnicliffe really was an amazing
artist and illustrator who still has quite a following. Hs measured bird drawings are superb.