Probably because in India and most of South-East Asia, the British influence
reined for years. They latched on to the Chinese belief that no home would
be protected unless there was at least one resident Gekko (also called
Tak-Tak's) in the house, and a "herd" of Gekko insured good fortune for all
who came under the roof. House warming gifts often were tiny Gekko's.
So, obviously Gekko's should have a British accent rather than speak a non-
universal language. Today's Ceico's Gekko is a voice obviously born
within the "sound of the Bells". The dialogue is right in keeping!

They are however, usually transparent, eventually taking on the color
of their environment. And there is NOTHING like having one of the little
suction footed, gummy cold guys unexpectedly drop onto oneself while sipping a drink
or reading a book.