I would personally invest with the cheapest reputable platform and for this particular fund (HSBC Islamic Global Islamic Fund “IC”), AJ bell appears to be the cheapest from the options I have seen. I must say that you should do your due diligence as I don’t know your situation.
You may find this thread useful HSBC Islamic Funds - HSBC Islamic Global Equity Index Fund IC (GBP) KIID - #5 by Mohsin_from_IFG