I've always just risked it. As long as you don't let them become a nuisance that would give rise to a complaint under the same circumstances in any property, then you should be ok. I'm sure there are certain things you should do, like not position a loft or kit box within a metre of a boundary or whatever. Other than that, keep a pair of fan tails as droppers, who doesn't like to see doves in their garden.....?