Thank you for your prompt reply.
This worked, to some extent. I followed your instructions, and they essentially reset the options. This also mean that the messages (confirmations etc). were reset to the default.
Having changed them to the desired message. What happens now is that on submission the user is not returned to the same page, but the latest post that is listed on that specific page.
For example. On the index page my latest post displayed is called "post_1" so after submitting I land on the "post_1" page.
However, If I'm on the "post_1" page and then submit the form I'm returned to the same page.
If I'm on a category page, and then submit the form, again I land on the latest post of that category.
If I'm on a regular page, as apposed to a category, or post page. I am returned to that same page.