on a phase 2 clio, simply use the stock central locking solenoid, wired to a push to make switch on your dash. I got a live from my ciggie lights and my earth goes into my earth block for my install.
Some kits use relays etc etc, I just used wire and a switch, ona phase 2, it shouldnt cost you more than £5 for a switch and some wire. Admitidly I had some stainless steel push to make switches made which were about £10, but to make a push button boot release tha tworks when the ignition is on is very easy.
However does anyone know how ican make it work when the ignition is off?