I'm sure lots of people know about this website, but I've just seen someone complain about the costs of calling a company returns line so thought I'd put this in as a reminder.
If you go to http://www.saynoto0870.co.uk
you can search for alternatives to 0870 and 0845 numbers to cut the costs of calls. It doesn't have alternatives for everything, but is worth a look. I don't have any links with them but use the site regularly.
Hope that helps/ reminds someone.