He argues that David should give up dairy; perhaps he could turn to BL? (lowfield.co.uk)
What does this abbreviation mean, which a farmer (Brian) says to the other (Daivd) farmer? The word is voiced at 3’40” in its BBC's audio of 2014-10-24 Friday.
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Your quote is from a summary of an episode of the BBC radio series The Archers. A Google search for "BL Archers" reveals that BL is an acronym for Borchester Land, a fictional land development company appearing throughout the series.
Brian is apparently suggesting that David should try to make some sort of deal with this company, perhaps to sell his farm.