I went with [FONT='Times New Roman','serif']Anthony mongiello [/FONT]him. He does very good shots and has been used by a large amount of very succesful actors. He works from his home in North London and cost about £250.... drama students get a discount.
Get a copy of spotlight... justgo to a library, (or the spotlight office in Leicester Square which is always open to the public) and browse through the spotlight actors book. There you will see every single actors 10 x 8 and the photographers are always credited. Have a look at what sort of style of photo you want and go for it.