Thank you for the encouraging post mar_sea.
These journeys are not feasible using public transport as the commute will take its toll on the child. I was hoping to find a direct coach/van option - or otherwise relocate closer to the school.
There wasn't any intention of boasting as I appreciate all children are different.
glad you understood the sentiment. My child has his strengths and since he is academically inclined, I feel it is my responsibility to give him the best opportunity.
If you have your DS's best interests at heart, but still believe that his academic needs are best met by one of the distant grammar schools for which he has qualified, then the best thing to do would be to relocate to somewhere rather more convenient for whichever one you choose. At least if he has done well enough to guarantee a place at whichever school you rank first on your CAF, you can time your move for the summer holidays before he moves up to year 7, so if can at least finish primary school with his current schoolfriends.
Presumably, your choice of location will also be influenced by where you / your OH work? Personally, I wouldn't make a school place the reason to both move house and change jobs, unless I wanted to move and change in the first place.
Somewhere with good transport links to the school would make life easier for your DS and for yourselves, as familiarity with and easy access to public transport encourages independence.
Another consideration is school places for other DC, if you have them.
Seriously, though, are there really no secondary schools closer to where you presumably enjoy living and have social ties etc at the moment?