plot private purchase - fees?

What fee is one expected to pay as buyer when purchasing a plot of land privately as opposed to through an estate agent?
(plot with building permission on it - in the countryside)
And is it a good idea to do it privately (sign documents at the lawyer etc etc?)

 

Not sure I understand the question Mira, do you mean how much for the entire plot ?

 

Thank you for the information, JWK, which is interesting.

Although I was more thinking of: if a private person acts as estate agent so to speak to find a plot and he is supposed to get a fee, how much would this fee be in order to be fair but at the same type cheaper than the estate agent...