There seems to be a question whether this is a stick insect (as I was initially told) or a praying mantis. I have just been given a likely answer in that it is a stick mantis! So far I have not found that family in India but it does not appear to be well documented.
Within the Periyar tiger Reserve in an area which was partially open and partly wooded, close to a lake.
The location given was at the accommodation a couple of miles away from the actual sighting.