Thanks for the responses :-) I have identified the problem! It was with HTML::Parse. Instead I have used HTML::Strip and this not only fixes the memory leak but is also massively faster.
Thank you for pointing out the other bits too. As I say I am new to Perl so they are very helpful. I will look into the security problems but as the machine is completely isolated (no network connection) I'm not sure this is an immediate problem. I will bear it in mind though. And graff I like that loop more - looks more elegant!
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