>>>Just to give an update on this:
>>>
>>>I think you are all correct with your suggestions. It seems that the escape key does not actually interrupt the currently running statement, therefore, there is no-need to re-run it using retry.
>>>
>>>So, I have removed my retries, which fixes the nesting errors.. problems solved!
>>>
>>>Thanks
>>>Will
>>>
>>You're welcome.
>
>"You're welcome"?

I think this is what I suggested in my reply.