Perron Rigot is hosting a Discovery Day in Docklands on the 17th of June.
There's a small fee to attend (£10 or £20, not sure) but it is redeemable against purchases.
It's actually a half day session where you'll get to try out the range of waxes and accessories. Their trainers will be on hand to demonstrate and answer any questions.
Jack Dunn might be along in a minute.....
There are many other reputable brands out there, some of which may send out samples. Why not contact a few companies and try a few for yourself to see which you get along with?