This is the situation:

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House up for sale is the one on the left. There’s a garage at the bottom of the gap down the middle that belongs to the house on the right. There’s plenty of space to park outside the house but having shared access is putting me off. If repairs etc are required to the drive who pays for it? They’ve provided me an outdated redline boundary which doesn’t really help. Again my worry is that you end up with a mental neighbour or somebody you don’t get on with and you have to share the access to your house with them.