Homepage forbidden, others blank

My homepage
https://www.lewesoperatic.co.uk/
returns a forbidden error and all other site pages return blank.

WordPress is installed at https://www.lewesoperatic.co.uk/bar_man/
and returns a 404 on the site template,

wp-admin is unaffected.

Permalinks are index.php/%postname%. I had been trying to get rid of the index.php and had moved the file to the lewesoperatic root. This failed and moving it back didn’t fix the problem. I subsequently restored wordpress which also failed to fix.

.htaccess is currently

# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>

# END WordPress
Options All -Indexes
RewriteCond %{HTTP_HOST} ^lewesoperatic.co.uk$ [OR]
RewriteCond %{HTTP_HOST} ^www.lewesoperatic.co.uk$
RewriteRule ^main\.html$ "http\:\/\/lewesoperatic\.co\.uk\/" [R=301,L]

How can I fix this please?