I just called my AME and he too said that this huge amount of green tea could be the cause for my extrasystoles - or at least made them worse. He wants me to do another 24 hour ECG. So be it - I will do another one next week. By the way: sleeping with this halter is a nightmare!!!
Thanks for your help all, I will of course keep you updated!
@SoftParade: have you heard something new?