It's not too late to enter for a re-sit. They can enter you for June 2005 for GCSE ICT, and you need to submit the coursework again. According to your GCSE grades in your signature, they are excellent in my opinion. Universities will still like your GCSE grades.
If you really want to re-sit GCSE ICT, talk to the examinations officer. I'm not quite sure about the re-marking as they are one year ago already. In addition, the re-marks should be taken place last year.