Is it turning over or is the car dead again Bigfellah? If the new battery has gone flat then you have a serious earth which is draining current. The culprit is often electric windows or the electronic alarm/immobiliser. You can check by switching off the ignition and then locating the relevant fuses. Put a multimeter across the fuse to see which circuit is draining current. Alternatively, take out each fuse overnight and see what difference that makes.
Sometimes, the battery can drain due to a boot light remaining on when you close the boot. That happens when the boot light switch fails to turn off the bulb. That's an easy check. If you don't feel comfortable with the dark art of vehicle electrics then call a local vehicle electrician, or go to a local service station where they can do a few basic checks.
Good luck.