I would very seriously look at using a courier company/freight forwarder, not least because you will be permanently exporting (from the UK) and then importing (into India) something that is clearly of considerable value - irrespective of whether or not it's a gift.

You potentially will need to carry the right paperwork, and make two declarations. That is by no means straightforward and you should probably take expert advice. I can tell you, from nearly once having to hand deliver some commercial goods with a UK origin to the US, that there are a great many barriers that most of us would never, ever consider but if not followed could lead to long delays in customs at best and possibly fines/confiscation at worse.