Well, the divorce stands valid unless any of the party files a case in India within a reasonable time, that the UK divorce was obtained by fraud or coercion. If you have agreed on all terms including financial and child custody, that can't be undone unless exceptional circumstances are established in later cases of at all preferred.
It's better to file for an execution here in India. You need not come to India for that. Both parties can appoint GPA and do it virtually if need be. That's permissible, I've done it in a case.
All the best.