As a rule the choice for transport to the weekend is going to be a coach or a convoy of cars and/or minibuses; the very fact that most houseparty venues are rural rules out the possibility of going by train. If you are booking a coach do phone around various companies as the quotes can differ significantly. When they quote you a figure, take a deep breath and remember that the price is going to be split between about 50 people.

If you have enough people who have cars and are willing to drive them to the houseparty then it is your responsibility to make sure each has clear travel instructions and a map. Do a doublecheck to make sure that no-one is left without a lift. Passengers should expect to pay the driver.