THREE top songwriters have written for Mrs. Brown, You've Got A Lovely Daughter, Herman's Hermits first major feature film.     They are Graham Gouldman, who wrote "Bus Stop" and "No Milk Today," Geoff Stephens who wrote "Winchester Cathedral" and American songwriter Kenny Young.     The film is currently in production at Shepperton Studios, and Herman's Hermits will also film on location in Manchester. Record producer Mickie Most is in charge of music for the film.

HERMAN'S HERMITS and the Love Affair are to co-star in a short concert tour next month. Only six dates will be played, none of which is in London - although the largest possible provincial venues have been selected for the itinerary. Dave Berry has also been booked for the package, and other supporting attractions are currently being set. This will probably be Herman's only concert tour this year, due to his extensive overseas commitments in the summer and autumn.     Dates and venues for the mini-tour are as follows: NEWCASTLE City hall (April 13), PORTSMOUTH Guildhall (14), LEICESTER De Montfort Hall (15), BRISTOL Colston Hall (17), BRIGHTON Dome (18), and BOURNEMOUTH Winter Gardens (19).     The Love Affair's already reported Scottish ballroom tour has been extended by five days, and will now run from Good Friday until April 12. The group is also likely to pay a two-week visit to Israel in May and details are at present being finalised by its agen Danny Betesh.