I have an indesit is70c condenser drier and it doesnt seem to be collecting all the water in the water container. some seems to make it into the container but then the rest just sits in the container drawer and spills out when you go to empty the water container .. any ideas??

To take the lid off, remove the two screws at the back and slide the lid backwards. If you try to lift the lid up, you will break the plastic catches. I learnt the hard way. If you do it correctly, it's easy.
At the back of the tray that holds the water container there is a small hole which allows access water to drain back down into the pump. Clean this hole(it will probably be full of fluff and hair). While you are there, there is two tubes at the back off the drier the thicker on of the two is the one that the access water drains into, make sure this is not split(mine was and I used self amalgamating tape on it to seal it again.) Replace lid, replace water collector, job done.