I have read on this forum that perron rigot is a good wax to use.
I only want to purchase one wax for everything ie face, legs, sac/crac etc is this possible?

It's possible to purchase one brand of wax for everything (e.g. Perron Rigot), but my understanding is that you'd be much better off using at least two different types of waxes - strip wax for large areas such as legs, arms, backs, etc, and warm wax for sensitive areas such as facial and intimate waxing.

My favourite for all sensitive areas is Perron Rigot, Euroblonde. You can of course wax any part of the body with hot wax, however, it would work out rather expensive and takes more time. You should also get a strip wax and I recommend Perron Rigot, Cristal Ocean.