The bio-blurb in my Penguin Guide to Jazz says this about Mr. Fairweather (1927-93):
Born in Edinburgh, he co-led groups with his frequent partner Sandy Brown from the early ’50s and helped pioneer the development of the British mainstream sound. He worked with Acker Bilk in the ’60s, but thereafter became a teacher and played less often.
And about Mr. Brown (1929-75):
Born in India, he group up in Edinburgh and was playing clarinet there in rhythm clubs as a teenager. He formed a band with childhood friend Al Fairweather and then came to London. He moved from simple trad beginnings to a mainstream style which became increasingly sophisticated, although he recorded little. He also worked as an architect, building sound studios, and was a gifted writer, but illness curtailed his activities, and he died young.
The song below, Yaknik, is on a 1962 album called Studies in Brown, on the Columbia UK label (SEG 8157).