Creating A Rockery

Hi there.
I have a NW facing front garden and would like to create a rockery on my side of a 4ft. brick wall.
I am in South London. Any ideas of a selection of plants and shrubs that will give a bit of color all year round?
Would the vibrant colored heathers and small grasses work??
Also, a friend has a very large NE facing garden in the same area and would like to start growing a vegetable garden......
Any type of vegetable for beginners would be ideal. Also, soil type recomendations would be appreciated.
Thank-you
--
GrowGuru


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