LONDON (Reuters) - British retailer Marks & Spencer said on Wednesday it would accelerate its latest turnaround programme as it dealt with the fallout from the coronavirus crisis and reported a 21% fall in annual profit.The firm said in the light of the prolonged partial or total lockdown envisaged in its Covid-19 scenario, it had taken action totalling about 1 billion pounds relative to its original budget to reduce costs and manage cash. M&S made a pretax profit before one-off items of 403..