Just got off the phone to a very helpfull chap at the CAA. If you have a JAR-FCL licence you need 1500 hours THEN you need to do an LPC before blue becomes green. - Tron is correct.
You can do an LPC off your own back whenever you want after 1500 hours and then send the form off. So where does one go about hiring a 737Ng and exmainer and how much dosh? Less than 7K I would imagine.