Jan 12 (Reuters) - India's Tata Consultancy Services
* Exec says digital is doing well and we will continue to grow with a good trajectory
* CEO on asked if he was getting the Tata Sons Chairman position: says "lets not speculate"
* Exec says there is no Brexit related impact on any client
* Exec says don't expect any one off gains in Q4, it will follow the normal trend Further company coverage: (Reporting By Sankalp Phartiyal)