manyaonisland wrote:
- Sorry but seems unlikely if you count 3 months from 15th May it comes out to 15th Aug.. so you would not be able to travel to India as your Grace period runs out.. Moreover you would not be able to enter in UK when you come back in Sep as your ILR (assuming you have one now) is supplanted on 15th May when you take oath. So you have no valid travel document to enter UK.
It is true that indefinite leave to remain (or any other immigration "leave") ceases to be valid when a person becomes a British citizen, simply because the person then has the right of abode in the UK and does not require any "leave"(i.e. permission) at all to enter or stay in the country.
It is also true that the Indian passport that would be used to re-enter the UK in September would not be a valid travel document in that its issuing country (India) would not consider it so. The fact that it is still in the holder's possession and has not been physically cancelled does not alter that fact.
Nevertheless, I am not sure if there would be any practical difficulty in entering the UK. As someone has noted above, people who have recently naturalised as British citizens do sometimes enter the UK using their old "leave", and in reality, recently naturalised citizens doing this are not going to be high on the Border Agency's list of people to be watching out for.
One thing to think about though is if the OP wants in the future to get an Indian visa in a British passport or apply for OCI, will the fact that a non-valid passport has been used for travel into India (or, in fact, out of India) when the holder was no longer an Indian citizen have adverse consequences. I don't know the answer to that.
And, also as noted above, the main problems arising here are entirely unrelated to British citizenship, so more knowledgeable answers might be available in other parts of the forums.
