Answer: There is no danger in planting these crops in close proximity. Cross pollination is only a danger if you are trying to maintain pure seed strains - the seedlings of cross-pollinated varieties will have mixed genes. Fruit will be unaffected by close proximity unless there is overcrowding that leads to competition for resources, or encourages disease. Just follow planting and spacing instructions that come with the plants or are outlined in a gardening book.
There may be some danger of disease or pests spreading from nearby wild brambles and currants. Clear away the wild plants if they show disease symptoms. Best of luck - enjoy that fruit!
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