So Tony you want your crossover to be adjoining your neighbours???
I don't think that that should be a problem funnily enough. There are some lots that have adjoining crossovers in our estate, it's not comonplace, but there are some around. You are lucky that they haven't started the roads yet. You might be okay???
See how you go. Good Luck.
I dont mind the crossovers adjoining, most houses in the UK are like that anyway.
I had a look at the Chase on Google Earth, there are loads of adjoining ones scattered around.
Fingers crossed they will change it for us.