First i have a 83 AC 2.0Ltr CU. I'm no mechanic but willing

My calipers were leaky/binding and in a real bad state. My garage failed them on the MOT. So i went out and bought new and bled them through. From complete inexperience and stupidity i thought maybe i could get away with not bleeding the rear drums. The front calipers were completely bled but the pedal needed to be floored to lock the wheels so i gather there is still quite a bit of air in the system.
I took the rear wheel off to get accsess to the bleed nipple so i could sort them out and i couldn't find a bleed nipple anywhere? I goolged and all show the nipple sticking out of the back of the drum as part of the brake cylinder.. mine seems to be different and there is deffinatly not one on there... how do i bleed them?? Driving me mad.. i have followed the lines under the van and i cant seem to find any point..
Please help!

Cheers, Joe