i have efi converted my s1 and i do not run a accumalator also i run the standard s1 fuel lines and i also did away with my fuel pump relay and rewire my pump fully to a efi tank with a walbro in tank pump though im led to beleive you can use the standard rs turbo tank and pump, theres not really a lot to mention,
you will however need a late mk4 escort throttle pedal with the cable drop in type not the ball clip style