If you have already pledged for a reward go to the ‘At-issue’ Kickstarter page and click on the "Manage Your Pledge" button.
In the "Pledge Amount" box, add an additional £25 (or multiples of if you require more) to your original pledge.
DO NOT change the reward tier you have already pledged for.
If you have not yet pledged to ‘At-issue’ press "Back This Project".
Choose a reward tier (you can select no reward if you don’t wish to receive anything other than the t-shirt)
Please note if you decide to choose an additional reward you must add the value of that reward to your £25 pledge. E.g. You also choose £15 reward tier to receive the desktop wallpaper and the postcard. The total value you must pledge to receive both is £40.
At the end of the Kickstarter campaign you will receive a survey so you can tell us how you would like the additional add-on pledge to be assigned, and what size t-shirt you require.