Council of perfection: Spread 6 inches of compost/manure over the whole
area
and double-dig in then add more for each plant.

I thought that you were not supposed to double dig on chalk as it brought
the chalk up to the surface? Also I'd be careful about using too much
chicken manure as I used that and ended up with no flowers as (in theory)
the chicken manure had produced a high level of nitrogen - maybe some other
kind of manure woudl be better?
Hayley