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There are two main pockets of Sikh Sangat in London: West London (Hounslow, Southall, Hayes, Slough etc.) and East London (Ilford, Barking, East Ham etc.)
For a train commute to King Edward Street (St.Pauls Station) your best bet (commute wise) would be E.London, where the commute from Redbridge Station is 30mins. As Bhai Amanjot Singh has said, there are plenty of good Grammar/Private Schools (fee-paying) in and around Redbridge.
From W.London, Hounslow West Station to St.Pauls Station, your commute will be at least an hour. There are some good schools there, particularly Khalsa Primary School (Slough, Ages 3-11), who will also be opening up a secondary school in September. There is also the popular Guru Nanak Sikh College (Hayes). A new secondary school, “Nishkam School” will be opening in Sept, and though they will be taking students 4-19, they will initially only be taking Primary School Children. Another advantage to W.London, is that you’ll be very close to the main London Airport – Heathrow (15mins). If you’re living in E.London, the commute to Heathrow will be approx. 1 – 1.5hrs.
In saying all this, I’m not taking into account your budgetary requirements. The areas I’ve mentioned are popular migrant areas, and there is a lot of competition for places in good schools, so you’ll have to start early in that department. School wise, many of them have catchment areas, which means you’ll have to live in a certain area to be able to go to that school.
I’ve personally lived in E.London for most of my life, and have moved to W.London in last 4 years. If you want any more information, feel free to PM.
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Navroop Singh