With regards to limit and SL/TP orders, when LMAX Exchange is closed for those 5 mins, there is no trading activity, and no market maker is quoting. This means that no orders will be executed. If in the open (after the 5 minutes close) the market price has changed, any limit/SL/TP orders will be sent to the market and will be executed at the available price in the exchange at that time (after the open, that is..).
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