Initialise superclasses

[Pierre-siddall]

PR Summary

Code Reviewer: @james-bruten-mo

Dependabot seems to have raised some uninitialised superclasses in classes which override either attributes or methods of the superclass . This PR ensures that the scoping on these overrides are correct so that the python interpreter has no doubts as to what is being overridden.

closes #209

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[james-bruten-mo]

Looks good