In January 1978 they toured New Zealand and performed at the Nambassa festival. In February their next single, "Women in Uniform", was issued and peaked at No. 8, while its album "Guilty Until Proven Insane" followed in March and reached No. 6. The album was produced by Americans Eddie Leonetti and Jack Douglas. The second single from the album, "Megalomania" issued in May, did not enter the top 40. Strachan told band members he intended to leave—but it was not officially announced for six months—he continued regular shows until his final gig with Skyhooks on 29 July. Strachan released further solo singles, "Mr Summer" in October and "Nothing but the Best" in January 1979, but neither charted in the top 50. Strachan's replacement in Skyhooks, on lead vocals, was Tony Williams (ex-Reuben Tice with Macainsh).