Neasden Temple (Shri Swaminarayan Mandir)
London Attractions : London Sightseeing
When finished in 1995 this was the largest Hindu temple outside India.
There is an exhibition about understanding Hinduism and free guided tours and audio guides. This is a sacred place and does have guidelines regarding dress code and behaviour, so please check their web site for more information before visiting.
UG: Neasden 1.03km
OG+UG: Stonebridge Park 1.12km
OG+UG: Harlesden 1.27km
Check their website for opening and event timings.