By Charlie Conchie Fast-fashion retailer Shein could kickstart its plans for an IPO in London as soon as this week and set in motion what would be one of the London Stock Exchange’s biggest deals in over a decade, according to reports. The Chinese-founded Gen-Z favourite, which has been meeting with London Stock Exchange bosses in recent months, is on the cusp of filing an IPO prospectus for approval with the Financial Conduct Authority, Sky News’ Mark Kleinman reported. The application could come as soon as this week, though there was a possibility it will be delayed to later in the month, so…