the errors i see when adding an item to the cart are:
Warning: Missing argument 10 for addtocart() in /srv/disk4/89822/www/oldtheatreposters.co.uk/WA_eCart/OldTheatrePosters_PHP.php on line 28
Warning: Missing argument 11 for addtocart() in /srv/disk4/89822/www/oldtheatreposters.co.uk/WA_eCart/OldTheatrePosters_PHP.php on line 28
Warning: Missing argument 12 for addtocart() in /srv/disk4/89822/www/oldtheatreposters.co.uk/WA_eCart/OldTheatrePosters_PHP.php on line 28
Warning: Missing argument 13 for addtocart() in /srv/disk4/89822/www/oldtheatreposters.co.uk/WA_eCart/OldTheatrePosters_PHP.php on line 28
Warning: Missing argument 14 for addtocart() in /srv/disk4/89822/www/oldtheatreposters.co.uk/WA_eCart/OldTheatrePosters_PHP.php on line 28
Warning: Cannot modify header information - headers already sent by (output started at /srv/disk4/89822/www/oldtheatreposters.co.uk/WA_eCart/OldTheatrePosters_PHP.php:28) in /srv/disk4/89822/www/oldtheatreposters.co.uk/c.php on line 856
these erros will happen if you create the add to cart button on the page, then edit the eCart object and add additional columns.
any time you add additional columns to the eCart object, you will need to edit the add to cart button behaviors that have been created to have them regenerated.