How can I bleed my fiesta braking system?

recently refurbed brakes on a 1995 mk3 fiesta 1.1 quartz. significant fluid loss during refurb. Now I come to bleed and refill system, numerous pumping on brake pedal has produced only the most minimal dribble of fluid from rear left bleed nipple. Can anyone advise. it should be straightforward operation but the reservoir level is not going down so no leak in system. Checked that nipple is not blocked and undone enough to let fluid pass through.