'running alongside the road' does not mean the services are connected to and available for use in the field. I would check for any manholes/meters and enquire further to ascertain if they were ever able to be used in the field. If not, you would end up paying for the initial connection of the services which could be moderately high, and I would factor this into the cost of the land.
In my experience with the water company is that their location plans of their (especially) rural service routes are somewhat less than perfect sometimes.
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Presumably the electricity supply is overhead (probably cheaper to connect than underground) and should therefore be obvious by its existence, to supply the field I think at a minimum there would have to be a pole erected and basic ancilliary termination in the field to carry the cable connected to the main supply.
Good luck, hope all goes satisfactorily for you.
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