rushax on "HTTPS [ADMIN Dashboard Unavailable]"

Adding HTTPS to my site and my login page doesn't allow me to log in. Just says, "Sorry, you are not allowed to access this page."

I've tried the suggestions from https://wordpress.org/support/topic/wp-admin-sorry-you-are-not-allowed-to-access-this-page?replies=4 but still nothing.

What is the URL of your site, and how exactly did you set everything up for HTTPS?

http://raysplastering.co.uk
I've completely wiped WordPress and re-installed it as I think there was issues with the database.
I'm having to wait 10 minutes for the phpMyAdmin tables to update properly at the moment. Just having problems with mixed content warnings on the admin area.

Ok, it doesn't look like you setup HTTPS properly.

Please review https://make.wordpress.org/support/user-manual/web-publishing/https-for-wordpress/ for details.

I've tried that solution but when changing URL to https in the General settings under Options I get an infinite loop redirect as I think it's clashing with CloudFlare's Flexible SSL. Then I also can't get into the admin at all and I had to reset through phpMyAdmin.

See if there's any improvement if you try that with Cloudflare's protocol rewriting switched off.