So after following the advise given I went through all of my pages and stacks disabling the warehousing in order to expose any locally ‘hidden’ images (a few were indeed found) which enabled me to click the ‘x’ delete button and then restore the warehoused versions (it was good to see that the url path to the warehoused versions wasn’t lost which saved me having to utilise text-expander to help with that possible task !!)
I then deleted the entire site folder both locally and on my server and republished to both.
As predicted all local image files were no longer present and the site references the warehoused images (and videos) without issue.
When I looked at the site folder size previously - with some of the local images intact - it stood around 15mb.
This size has now reduced significantly down to 6mb which is a welcome saving.
As you are aware the site is still in formulation but I believe I am now working much faster and more efficiently thanks to your help - Robert at Joe Workmans and Andy Tavernor at Big White Duck.
Thanks to you all for your help in making my transition from Freeway much easier than it would have been.