Loads of houses have 65a supplies, more modern larger houses have 100a supplies and very large houses (the sort that might have outbuilding and swimming pools) will have 3 phase supplies.
The standard sized tails are 25mm sq, with a 16mm main earth tail if TN system.
Could you elaborate on what you think you need, will you have outbuildings, what sq ft is the accommodation in the property ?
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