Unable to access admin web page

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I solved this by following the instructions here;

http://www.beyondmyfrontdoor.com/wp/how-to-fix-wordpress-reporting-the-wrong-php-version/

I turned out that the .htaccess file was loading an old version of php as follows;

# Use PHP55
AddHandler application/x-httpd-php55 .php
<IfModule mod_suphp.c>
suPHP_ConfigPath /opt/php55/lib
</IfModule>

I commented this out and it now allows me access to the admin web page again.