Hello. Firstly I would suggest removing your complete postcode from the forum as your address can be narrowed down to a few houses by it and maybe that is a bad idea.
Secondly, and I know there will be other views on this, I would absolutely not ever recommend moving so your child can go to grammar school. As has been said on here many times before, they are just schools - not so very different from other schools and if you live in an area without them the chances are you have some good alternatives nearby and don't need to think of uprooting your family. In fact just a few lines down on this section of the forum is a thread about it:viewtopic.php?f=5&t=36626&start=110
I have to say I completely agree. Living near a grammar is a double edged sword indeed. The alternatives always suffer by the presence of a grammar school. Lovely for those in the grammar, not so good if you don't get in. Not saying others are awful by ANY means, but they DO suffer.
Better if you move anywhere, to be sure you are close to one of the secondaries that has a great name in your area, your child in one of its catchment primaries, and in an area you love for its people, neighbours etc.