the pillars of society do it a hell of a lot more than your average Joe
No they don't. They may choose to live close to a good school but they don't use a false address. Hundreds, possibly thousands, of parents are caught doing this every year. Some will end up with the school they would have got had they used their genuine address. Some will end up with a worse school than they would have got, so they actually disadvantage their child by doing this.
very little they can do if you have a proper tenacncy agreement and council tax registerd
Rubbish, as people find out every year. Councils regularly catch people who have taken these precautions.
Some councils are better at catching fraudulent applications than others. In general the councils where there is a real problem with people using false addresses are best at catching fraud.
Anyone reading this is, of course, free to take James9669's advice. But you need to be aware that, even if you manage to get a place this way, your child could be thrown out of the school if the LA find out what you have done, and not only in the first term. Some people have had places withdrawn much later than this. You also need to be aware that, if you are found out, your child may end up at an even worse school than the one you would have got if you had been honest. Do you really want to take the risk?