This is a plug for the artists' cooperative I'm a member of:
They sell my prints and cards, (selection below!).
One of the few truly affordable galleries in central London, selling original work!
Location: it's in Gabriel's Wharf, next to the Oxo tower on the South Bank in London.
Open every day:
currently 11.30am - 6.30pm and Saturdays 10am - 8pm
winter opening hours from 30th October: 11.30 - 5pm (Saturdays 10 - 7pm).