I had the very same question. After a lot of digging I was able to figure it out. Try something like this…
# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^real-mortgage-for-real-people$ https://www.mortgageadvicecenter.co.uk/mortgage-news/ [R=301,L]
RewriteRule ^are-you-not-the-perfect-mortgage-applicant$ https://www.mortgageadvicecenter.co.uk/mortgage-news/ [R=301,L]
RewriteRule ^there-are-funds-available-to-borrowers$ https://www.mortgageadvicecenter.co.uk/mortgage-news/ [R=301,L]
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>
# END WordPress
