Upvote:3
Visitor applications in New Delhi are processed at the BHC hub there and generally take 15 working days before a decision is reached; this is capped by a ceiling of 90 days.
In your case an application submitted on 29 September would be ready by 20 October, plus another day to be sent back to the Visa Application Centre, plus whatever delivery time is appropropriate.
Given that you do not qualify for the premium service, you would be very lucky indeed to get a decision and delivery by 11 October, but there are still 3 days left for it to happen. Note that they advise applicants not to purchase flight tickets in advance of a decision.