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AJ bells seem to have the complete variety of Islamic funds available and their platform charge is cheapest among Islamic options. The two popular options are HSBC fund and Ishares MSCI - a discussion around these can be found here Selecting an ETF - #4 by Zeeshan
On your 15 plus year horizon, maybe 80-90% in HSBC and 20-10% in the MSCI Emerging market to get more exposure in China…