The letter references an AIC, which directs readers to a JAA website. Sorry to be unhelpful, but I don't have the letter in front of me just now.
For SEH, the LTE for a 3 hour minimum conversion time for SEP and SET, which had modified the JAR-FCL 5 hour courses, is now replaced in FCL-2 Amendment 6.
The SEP to SEP and SET to SET minimum flight time is now 2 hours in each group, EXCEPT the R22 and R44: which go back to 5 minimum. (And no credit if R22 to R44 or vice-versa.)
The MEH (MET to MET) is now, broadly, 3 hours minimum flight time.
Add the time for an LST to the above.
There are other changes in AL6 too, but I hope this answers your question.