It can be quite tempermental but hand pollination should do it. That said, in some species some clones will self-pollinate and others wont.
Myles

Thank you Passionflow. I've got a p.laurifolia. My first attempt at pollinating it failed. The pollens just wouldn't adhere.

There are new flower buds coming up now and I will attempt to hand pollinate again.

Pollination failed again. This time round I had 2 flower buds. One reached the stage where it almost bloomed, but just didn't and then the bud dropped. The other bud bloomed and I did the pollination. It seemed the pollens adhered but 2 days later the flower dropped.

So disappointed.