I had a posterior labour with DS. Basically there was back pain which was relieved (slightly!) with a hot damp nappy - Dh was heating them in the microwave, he'd apply, the contraction would end, and he'd reheat on a cycle. A shower helped too.

The other classic element of a posterior labour that I had the misfortune to experience is that it goes on for hours, then just when you think you're getting somewhere, the contractions slow down. I started cramping at 3am on the Saturday, laboured all day, then just when we were thinking of going to the hospital in the evening everything slowed down, starting up again on the Sunday morning (I still had the contractions, just further apart - just far enough apart to stop me getting a good night's sleep!). Sunday it was much the same but more intense, this time we went to the hospital about 6pm to see what was happening and as I was 7cm they let me stay, I got in their big tub and the contractions died away again.

About 4 in the morning the midwife broke my waters and there was meconium so I had to go and be monitored - after that I got an epidural and some saline (as I was severely dehydrated) and had syntocinin - got to 8cm and no further, 3pm they said I had to have an emergency caesar and that's how DS was born - he was a whopper though (4.77kg) which probably didn't help much!