International Retail Service
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International Retail Service is a service provided by the London Stock Exchange that allows UK investors to trade in overseas stocks quoted in Pound sterling, without having to worry about exchange rates, through the CREST system (Thus allowing the shares to be in a dematerialised form).
Not all international equities are listed on the IRS. There are currently approx. 330 Blue chip/large cap equities available(primarily European and US companies).