Hey David,
I just ran your home page through why no padlock. The mixed content is fixed. But it reported a strange error on your certificate.
You have an invalid or missing intermediate (bundle) certificate. This may not break your padlock on all browsers, but will on others. Please contact your SSL Vendor for assistance with this error.
Never seen that one before?
https://www.whynopadlock.com/results/0b8f57e3-65cd-474f-8796-bf5802a7896e
Yes, once you are comfortable with your site not having any other mixed content or errors (I’d probably run more than just the home page through why no padlock).
You should add some redirects to the htaccess file.