This producer is usually at these markets:

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Bloomsbury
Bloomsbury farmers market
Every Thursday 9am-2pm
Torrington Square / Byng Place, behind SOAS WC1E 7HY.
High Street Kensington
High Street Kensington
Every Sunday 10am-2pm
Phillimore Walk, High Street Kensington W8 7RX
Parliament Hill
parliament hill
Every Saturday 10am-2pm
Entrance on the heath near tennis courts. William Ellis School, off Highgate Road. NW5 1RN
Swiss Cottage
Swiss Cottage farmers market
Every Wednesday 10am-3pm
Eton Avenue, Swiss Cottage, London NW3 3EU