Hi everyone.
I'm a keen wildlife photographer in the UK with a special interest in herpetology (reptiles & amphibians).
I have just started collecting stamps depicting images of our native herpetofauna in the UK. I'm particularly interested in stamps with images of the snake "Vipera berus" or the "Common Adder". Despite the UK never having released any stamps showing images of our native reptiles I have found many other countries that have. So far I have identified 12 different stamps from across the world showing the Vipera berus (which is a snake native to the UK) and I thought I'd come to this forum and ask for your expert knowledge and advice on the subject.
Does anyone know if there there any other stamps that have been released showing images of this particular snake that people are aware of? Or can anyone advise me on how best can I search for other stamps depicting this snake that I haven't yet found? This snake does have a few names by which it is known:
Vipera berus
The Adder
The Common Adder
The Northern Viper
Thanks in advance for any help you might be able to offer me on this search.

Kind regards,
Jason
.