Put your oven on at 220 degrees or at gas mark 6,put beef in roasting tray and put some water at the base of tray, season lightly with salt if liked,dont add any extra fat,in oven roast for about 20 or 25 minutes, then reduce heat to say 190c or gas mark 4,baste occasionally and add more water if needed, makes excellent gravy and keeps the meat moist,cook for another 20 or 25 minutes, take out and test to see if the blood is running slightly from the centre, if you are happy put on the side to rest for at least 20mins then carve, remember if you have a fan oven it will be a slightly lower temp and not take as long, p.s dont cover in foil bon appetite!!!