RewriteEngine on
RewriteCond %{HTTP_HOST} ^wegotoseawithyou.com [NC,OR]
RewriteCond %{HTTP_HOST} ^www.wegotoseawithyou.com [NC]
RewriteRule ^(.*)$ http://www.marthaorbach.co.uk/we_go_to_sea_with_you.html$1 [L,R=301,NC]