Secure Python code - volunteers for code review?

[andrew blah]

Thank you all very much for your helpful comments.  I will take them
into account.

A few people credited me here with having written the code.  Kind - but
I'm the project lead - not the person who wrote the code.  The code was
written by Mark Hammond - that would explain why it is well written.

Thanks again to all for the comments and guidance - most helpful.
Regards

Andrew Stuart