Multisite – This web page has a redirect loop error

I added Multisite to my current WordPress install as a sub-directory

I followed the correct procedures and added the code to my wp-config and .htaccess files.

When I try to access the dashboard of the newly created site from the Network Admin -> Sites . I get the “This web page has a redirect loop” error. If I try visit, it goes to the site but with a blank template layout.

My wp-config settings are as follows:

define( 'WP_ALLOW_MULTISITE', true );

define('MULTISITE', true);
define('SUBDOMAIN_INSTALL', false);
define('DOMAIN_CURRENT_SITE', 'www.mywebsite.co.uk');
define('PATH_CURRENT_SITE', '/');
define('SITE_ID_CURRENT_SITE', 1);
define('BLOG_ID_CURRENT_SITE', 1);

define('ADMIN_COOKIE_PATH', '/');
define('COOKIE_DOMAIN', '');
define('COOKIEPATH', '');
define('SITECOOKIEPATH', '');

define( 'AUTH_SALT', 'sCn)d[:x0k),nyExWvMH3(WHq,R;OiAaB,4XN@f?<5i=2iK$,de],+d+5&4)))VA' );
define( 'SECURE_AUTH_SALT', 'Jz-CX-WkVL+Q~r*Xk/j3P&k#^,cwFNCD4fw770|rGni!<code>Z</code><)|!e+Y+a86%{cW6e' );
define( 'LOGGED_IN_SALT', 'xGMv$^6J9Yu/K;QqM@9<Ng0ym]l}FD:$<w>.V{Y:*<-k2BgI|M]lNu5+~w&0?7ex' );
define( 'NONCE_SALT', '-QW:yLNl>H<fuBetQ#E;45s]n{xjTwfCqcKT-3Q$|ykAis8kYgXcu9u(hP-r$VK!' );

My .htaccess settings as follows:

RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]

# add a trailing slash to /wp-admin
RewriteRule ^([_0-9a-zA-Z-]+/)?wp-admin$ $1wp-admin/ [R=301,L]

RewriteCond %{REQUEST_FILENAME} -f [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule ^ - [L]
RewriteRule ^([_0-9a-zA-Z-]+/)?(wp-(content|admin|includes).*) $2 [L]
RewriteRule ^([_0-9a-zA-Z-]+/)?(.*\.php)$ $2 [L]
RewriteRule . index.php [L]

Any help is much appreciated.

Thanks

Liam