Most Goans work at GWH. A Hindu temple opened in Cheney Manor recently to cater for the 10,000 strong Hindu population. There has been a strong Sikh presence in Swindon for years. There are more Muslims, but most won't be Indian nationals.
Swindon has had an Indian community in Old Town for a long time.
In the 70's, I lived in the dover/prospect slopes and there were quite a lot of Indian families there.
The original Sikh temple was on North street near the Castle pub.
We used to play cricket in the street and Commonweal school had a really good cricket side in those days!