Mumbai, Sep 4 - Director R. Balakrishnan, also known as Balki, has decided to release his role-reversal drama 'Paa', starring Amitabh and Abhishek Bachchan, on Nov 13 as a tribute to Children's Day.

'It's a film about a child within a man and a man within a child. And I can't think of a better tribute to a child than Children's Day,' says Balki, who completed shooting the film in England recently.

Balki has shot his two feature films - 'Cheeni Kum', an unconventional love story between a 30-plus woman and a 60-plus chef, and now 'Paa' - in Britain because he loves the country.

'We shot 'Paa' in my favourite location England. Throughout the stint in Cambridge we were at sea never on land. I love shooting in London. If I have my way, I'd shoot all my films there,' he said.

Balki took up the challenge of projecting the Big B like never before in 'Paa'.

'In 'Cheeni Kum', I really didn't have to do anything. I made him play himself. Here in 'Paa' I had to bring out that child within him which has always been there. We tapped that part of him. It wasn't easy for Amitji to play a child at heart.

'Fortunately, Abhishek and Vidya Balan too are extremely intelligent actors. Vidya has played such a charming mom. Throughout the film they behave as if Amitji is their son. For Abhishek, this was his chance to get even with his dad,' said the director.

Any regrets about not casting Tabu again?

'After what she did with Amitji in 'Cheeni Kum', it wasn't possible to cast her in Vidya's role.