It's worth metioning that this distribution system is decided by the UK government (or possibly Eng/Scot etc governements). The EU allocates subsidy to the member nations according to one system (not accounting for e.g. bigger hedges), which allocate subsidy to farmer/business according to their own system. It is entirely possible for the UK government, within the EU, to allocate money to farms as an insurance system against bad years, or to encourage profitability at all costs, or in another way.