To start with you need a heavy duty extension cord thats rated to 15 amps. Then you have 2 options: either get a qualified electrician to install a 15A power point to plug into, or purchase an approved 15A to 10A adaptor (which is handy for travel anyway).

Can I fit a tow bar myself?

Can I fit my own towbar? The short answer is no. Fitting a towbar to your car is no easy task, and should never be done by an amateur. You can purchase your towbar, vehicle-specific electrical kit and towbar fitting in one simple package from Witter Towbars and even have it fitted at a time and place to suit you.