From the Radio Times:

7.35pm
Doctor Who
starring Sylvester McCoy
with Bonnie Langford
in Delta and the Bannermen
The first of a three-part
adventure by MALCOLM KOHLL
It's destination Disneyland and the year is 1959.  The Doctor and Melanie are expecting rock 'n' roll, beehive hairdos, sputniks and possibly Mickey Mouse.  What they're going to get is Delta and the Bannermen.
Theme music composed by
RON GRAINER
Incidental music KEFF MCCULLOCH
Costume designer RICHARD CROFT
Script editor ANDREW CARTMEL
Designer JOHN ASBRIDGE
Producer JOHN NATHAN-TURNER
Director CHRIS CLOUGH
★ CEEFAX SUBTITLES