By Anna Moloney Video may have killed the radio star, but builders are bringing it back. Fix Radio CEO Louis Timpany tells Anna Moloney how he built the UK’s fastest growing national broadcaster If you were asked to guess what last year’s most zeitgeisty radio station was, you probably wouldn’t have put your money on Fix Radio, a station dedicated entirely to tradespeople, where leading segments include the likes of The Heating and Plumbing Show. But, as it happens, Fix Radio was last year’s fastest growing national radio station. With over 460,000 weekly listeners, the station grew an astonis…