Geoff the testbook (T4) session will list all or rather any fault codes stored in the various ECUs on your car none of these codes are dated so they could have happened today or months ago.
Most will be historical e.g blown bulbs long since fixed etc. A good mechanic might pick out a couple of codes worth further examination but if T4 has not been connected to your car for sometime the only sensible thing to do is get a print out of everything then clear all the fault codes and repeat the test in say a months time that way you know for sure if the codes are new or not although again any codes logged may not relate to any real faults.
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