This will probably be exploited all over the internet by now, so it's surprising that it still works

- usually these things only last a few hours, but if you manage to use it then it WILL be honoured by the company.
There is nothing wrong with using more than one email address, any more than certain members order more than 1 set of free O2 sims advertised here, and then sell them on Ebay
Thanks for your consideration, but there is no come back for me if you choose to use more than 1 email address in order to obtain more than one voucher for future use.
However, note that their terms only allow the use of upto TWO vouchers PER ORDER. So the maximum discount you can obtain is £2 off the total of any one completed order. However it would be okay to do use upto 2 vouchers on every seperate order that you were to place

until all of the Vouchers are used.