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.
London Bridge
London Bridge
Every Tuesday 9am-2pm
King’s College London, Guys Campus SE1 1UL. Access from Newcomen Street and St Thomas Street. Next to Guys Hospital
Marylebone
Marylebone Farmers Market
Every Sunday 10am-2pm
Aybrook Street, Marylebone, London W1U 4DF
Pimlico Road
Pimlico Road
Every Saturday 9am-2pm
Orange Square, corner of Pimlico Road and Ebury Street, SW1W 8UT
Queens Park
Queens Park farmers market
Every Sunday 10am-2pm
Salusbury Primary School, Salusbury Road, London NW6 6RG
Riverside SE1
RiversideSE1
Fridays 10am-3pm
Morgan's Lane near HMS Belfast London Bridge City SE1 2AF
South Kensington (Saturdays)
South Kensington Bute Street
Every Saturday 9am-2pm
Bute Street, South Kensington SW7 3EX
South Kensington (Tuesdays)
South Kensington Imperial College
Every Tuesday 9am-2pm
Queens Lawn, Imperial College SW7 5NH
Swiss Cottage
Swiss Cottage farmers market
Every Wednesday 10am-3pm
Eton Avenue, Swiss Cottage, London NW3 3EU
Westminster Bridge
Westminster Bridge
Every Thursday 10am-3pm
St Thomas’ Hospital Gardens Westminster Bridge Road SE1 7EP