THE Spencer Davis Group and Herman's Hermits co-star with American visitor Vikki Carr in a special two-hour Light Programme pop show on Easter Monday afternoone (3:30 - 5:30 p.m.). Titled "Let The Good Times Roll" the show also features Keith Powell, Elkie Brooks, the Tony Osborne Orchestra and compere Ray Orchard.

BOTH SIDES OF HERMAN'S HERMITS (Columbia)     Here's the pleasant, happy beat sound of Herman's Hermits, which has chalked up 12 Top Ten hits in America in succession and is riding high in Britain again with No Milk Today. On this LP Herman has fun with the French language in Je Suis Anglais, recaptures the lilt of a George Formby hit, Leaning On A Lamp Post, charms with Listen People, and raves up with the group a bit with My Reservation's Been Confirmed. I liked best the tuneful revival of Story Of My Life, the 1958 Bacharach and David hit. Mickie Most produces this easy-on-the-ears album.     Other titles: Little Boy Sad, Bus Stop, For Love, Where Were You when I Needed You, All The Things I Do For You Baby, Dial My Number, Oo-ee Baby.