When choosing a hairdresser in Weston or anywhere else, word of mouth is just about the best recommendation, people are usually very careful about hairdressers they recommend. Another option is if you see a cut or style you like on the bus, train in Weston and ask where they had it done, people will only to pleased to tell you as they feel complimented by the question.
Most good Weston hairdressers will be happy for you to call or visit the salon in order to discuss your hair before you make an appointment. Take note of how many ideas the stylist has and how well they listen to what you want and like, be prepared for an honest opinion as to what they think will be the end result. Be realistic as to how much time and effort you are able to give to your look. Your hairdresser should give you a look and style that fits both your hair and your lifestyle. If your lifestyle means you spend a lot of time outdoors, with your job or for pleasure, you don't want a look that must be consistently protected from wind or rain, don't let anyone talk you into a difficult style if it is really not what you want.