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He was educated at the Grange Secondary Modern School in Stourbridge. Seeing Richard Harris in the film Camelot inspired him to become an actor, and he succeeded in getting an audition at Birmingham Theatre School. There, under Mary Richards, he thrived and when he left at the age of 18 he worked in a company touring schools and appeared in Rep in Birmingham and Coventry.
In addition to his role in The Archers, he has acted in several radio plays on BBC Radio 3 and Radio 4. In 2001, was in the Radio 4 drama Cool Water Murder. He has also presented on BBC national and local radio.
Harrison has made a number of records in the guise of Eddie Grundy, and in the summer of 1996 released The World of Eddie Grundy by Trevor Harrison on Demon Records. In 2001, The Archers' 50th anniversary year, he was made an MBE for his services to radio drama, particularly for his role in The Archers.