URL filtering works even without TLS decryption. But without additional steps you will not be able to inject a response page.
Did you check the URL log when you open this BBC player website? There you should (depending on how the website is built) be able to identify the website that you need to block (with a custom URL category).
the url is:
if i go via http then it is blocked, the https version works. There are a number of URL's displayed in ther URL Filtering log, none of which are bbc/iplayer.
The block page dispplays when browsing via non-https. How can i get this blocked when going via https and still display the block page?
This one is not possible without TLS decryption because the firewall sees only the fqdn (at best, but normally with a current browser). So for example if the URL would be iplayer.bbc.co.uk then blocking without decryption would work...
It depends ...
If you are only decrypting this one connection to the bbc website, then there shouldn't be big drawbacks.
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