The larger part of the FSA probe is likely to focus on the run-up in the M&S share price before Green made his first approach on 27 May. The M&S share price began to rise on the morning of 25 May, the day after the City's biggest social event of the year, the preview of the Chelsea Flower Show, of which Merrill Lynch is the main sponsor. The pressure of buying built up over the next 48 hours, forcing Green to let his intentions be known.