According to the Zavvi specific T&Cs (you have to scroll down a fair bit) the vouchers are valid till the end of March, I believe its the Britvic promotion that ends on the 1st March so you can't claim any more after that:
- Voucher is a single use voucher and can not to be used in conjunction with any other voucher offer.
- Voucher is valid from 00:00:00 01/11/2010 to 23:59:59 31/03/2011.
- Maximum Spend £100.
You can also sign up with several email addresses using the same physical address details, so I've currently got 9 codes to use. If I get through all of those, I'm in trouble.
Also another tip I learned from someone on here - you can sign up your own email addresses +1 (i.e. email@example.com, firstname.lastname@example.org, etc.) and they count as different addresses, yet they would all go to email@example.com
, so you don't have to piss off all your friends sending them random emails.