After a long research I found few hotels for Tamil Food in London, but cant compare with Hotel Saravana Bhavan(Suresh-Make a note)
1)Woodlands in Wembley and Marleybone street, costly though.
There are also Srilankan Tamil restaurants in Wembley and East Ham.
2)Sri Krishna in Tooting, combination of Kerala and Tamilnadu food.
3)Madras Restaurant, High street North , Manor Park.
4)Jaffna House, Tooting Broadway. Fantastic and affordable meals.
5)Taj Samudrah in Alperton, Wembley have got the best Kothu Rotis and Biriyanis
6)Shkoni IN Tooting, near to Mariamman Kovil.
7)Sri Radhika Restaurant in Ilford
8)Finally the best is Chennai Dosa at 353 High Street North, Manor Park, London 020 8586 7729. Another branch in Eastham too.
I heard that there is Mami Mess in Southall, not able to get the exact address