Found 18th Oct 2014
Was looking for a Specsaver eyetest voucher code and could only find expired deals. Used the following keyword search "specsavers eye test <> code vouchers". Replace <> with your town. One of the search links returned is a free eye test voucher that is valid until november 2014. The code is 8303 on the voucher. I just ran a test search on 2 other random towns and both worked.