Unless you live within a mile and it is your closest school you have no chance.
Lots of people apply on this rule but actually live closer to Francis Combe
I don't know what the distance is, but one mile gets you into Leavesden, and that would soak up the places quickly. Whatever it is, it will be a little better this year, as there will be an extra 18 places on distance that were taken off the test proportion by the adjudicator.
But distance to other schools does not come into it. Parmiter's will rank applicants on distance from their school only. As that's what they say in their published arrangements, to do otherwise would be to set up successful appeals.