The reason for Chiranjeevi's get away to London is being talked as scuttlebutt in Film Nagar. 3 reasons are seen for that.
It is said by one, "Chiranjeevi is always disturbed when his birthday approaches. The only reason is not being able to cope with the gush of fans and continuous phone calls wishing him HBD. He has been facing several obligations as well. He has been coping with that from several years but now got tired. He intentionally flew away much before his birthday this time and will be in London on the B-day as well, not reachable for many.
Secondly, this time, fans announced 'Chiranjeevi Janmadina Varotsavalu' that frightened him in bigger way. He understood that there will be several invitations for him from many of his fans and that becomes an obligatory for him. To avoid all this, he kept himself at bay this time for entire week.
On the other hand he also thinks in another way. If the fans run the shows and celebrate his birthday in his absence, he feels, that will increase his aura"
Well, Chiranjeevi's fans are carrying on their job as usual by donating clothes, food and basic needs for poor and tribal population.