How/where do i get tested for dyslexia?

im a 25yo male and ive allways had problems with my reading and writing. Nm how hard i try i just cant ever seem to spell words correctly. I went through two years at college and ped both years with distinction. The only problems i ever had was my writing/spelling. Other problems i have is reading outloud. When i read outloud i end up reading words that arnt there and it becomes very irratic. Im not sure if its my confidence or something else (dyslexia). Any ideas? I live in the UK.