London Attractions : London Sightseeing
This claims to be the worlds largest antiques market with over 1000 sellers. The antiques market takes place on Saturdays.
There are other types of market stalls open on other days, but not Sundays. See their website for details.
UG: Ladbroke Grove 0.28km
UG: Westbourne Park 0.55km
UG: Latimer Road 0.91km
Mon-Wed 9am-6pm, Thu 9am-1pm, Fri, Sat 9am-7pm.