Electrical intallation I have been given confusing information from different sources. Please settle once and for all whether you can use an ordinary 3 pin plug to install this pyrolytic cleaning oven and then plug straight into the mains. And if you do this, will AEG honour the warranty should anything go wrong? Also would this be the same for the B5741-5? Thankyou

Since the maximum output of the oven is 3.5kW (3500W). For a 240V electricity supply ( more commonly about 230V now ) ,the maximum current passing through the cord and plug can reach 15A. So you would need a 15A plug that has been designed to cope with the extra current, heat etc. ( Standard plugs are rated at 13A in the UK where the earth pin is slightly longer than the other 2 pins, in Australia a standard plug is only 10A) Likewise you would need a 15A powerpoint/wall socket to connect it into ( In the UK a standard socket is 16A in Oz 10A ). The wiring which connects back to the fusebox behind a normal power point is rated for 24A with a small safety factor built in to prevent overheating or burning etc. However 4 or more power points can be connected to the one wiring line coming from the fusebox. So if you connected 15A to a standard powerpoint you are already getting close to the maximum current that should pass along the wire without it overheating. Imagine if you also turned on the kettle or toaster which was on another powerpoint but connected along the same wiring then you are going to put maybe 25A through the wiring. Other things may be on other power points so you could easily overload the wiring which will cause overheating and a potential fire hazard or short circuit if your fuses don't blow first. That is why ovens are normally directly wired to the fusebox separately using 32A or more rated wire cabling to ensure no fire hazards in the home.
Your insurance company would very quickly see the problem and not pay you out too if some claim was made due to damage caused by inappropriate wiring. Likewise AEG would do similar as I doubt in the installation instructions it says fit a standard plug to the oven and plug it in to a powerpoint.

Check the wattage from the rating plate and that will tell you