The AGM should have been held last year. According to the articles of association which are essentially the rules governing the management company the AGM must be help once in every calender year i.e. 2010, and no longer than 15 months since the last one. (since it was december this wouldn't count but if it was January for example they couldn't wait until December the next year to have the next.) The last one was in December 09 I think maybe the 2nd or 3rd but quite early on. So it will also be 15 months from next week.
Have you spoke to the new management copmpany on this? and if so what responce did you get?