Error -- Could not open /var/www/www.subbrit.org.uk/httpdocs/uploads/lock to write file lock

A lock is a file which is written before modifying the data and removed afterwards to prevent corruption by two simultanious processes. The directory, /var/www/www.subbrit.org.uk/httpdocs/uploads/ has been defined on lines 6and 7 of the /var/www/www.subbrit.org.uk/cgi-bin/webdata.pl script.
The /var/www/www.subbrit.org.uk/cgi-bin/webdata.pl script must have read/write permissions to that directory in order to place the file lock.

You can disable the file lock on the "customize pages" screen.