The problem lies in the src URL to your picture. It would appear to be PlusNet's IP address and is probably private, internal, to yourself.
If you have such access, why not just copy and paste directly onto your design page?
I will assume your answer covers an update with periodic snapshots for monitoring purposes so you want a dynamic presentation.
It is unusual, but not wrong, to use an IPv4 URI but if this is your Webcam's IP address, you have exposed it and yourself to being hacked. If so, edit your Post as I have done in this reply.
I think you may need to read how to use DNS Port Forwarding with your router.
An example package is this: https://www.contaware.com/contacam.html.
Acorn
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