I have observed this many times, the volatility of some currency pairs is particularly high at 1 hour and 1/2 hour before london open. Any one know why?

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DislikedI have observed this many times, the volatility of some currency pairs is particularly high at 1 hour and 1/2 hour before london open. Any one know why?Ignored
DislikedI have observed this many times, the volatility of some currency pairs is particularly high at 1 hour and 1/2 hour before london open. Any one know why?Ignored