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Doggit
What a lot of people don't realise, is that you can even submit plans for a property that you don't own, and the council will view them objectively, and then pass them if acceptable (odd idea, I know) - then you can go and try and purchase the property afterwards if you so choose. The council don't worry about disputes between neighbours, only if the planning application will fit in to the surrounding properties. The neighbour has every right to submit any plans that he likes, but that doesn't mean that he'll get them passed. But whilst it isn't a good idea for your planning consultant to hate the architect, at least she'll have more experience than you do, so just keep an eye on what she's doing, and let us know how things progress. You can post a link to the application if you want and further comments.