OK, tried the fix above and it crashed the site with this message:
Parse error: syntax error, unexpected T_VARIABLE, expecting T_FUNCTION in /home3/karlcw/public_html/helensvintagecafeandcraft.co.uk/wp-content/plugins/wp-e-commerce/wpsc-merchants/paypal-standard.merchant.php on line 168
I put the lines of code back in and still get the same message.
Come on guys, let's sort this please.