I think it would be a great idea to actually split the farmers market into two or Three locations, therefore turning Forest Hill into something of a foodie destination which would hopefully attract custom from H.O.P Brockley. and Sydenham.
The ideal would be to have the existing market perhaps focussing on Fruit and Veg at the Horniman Location, with some 'snack' stalls.
Have Fish and Meat and more snack stalls in the station car-park, Then finally having Bread Cakes, and 'dry produce' in the area near the pools.
With the likes of Aga's and Sugar mountain setting up deli and sweet stalls outside their shops.
If You look at Borough market that is actually spread across more than one location, and actually splits into three distinct 'zones' and now there is also Maltby Street which is down the road but attracts customers from the old borough market.
This is just a thought, as we need to drive business down the hill and into the town centre.