Although British Sugar's state aid challenge was not upheld, it is perhaps not surprising that it felt aggrieved about evidence such as civil service emails noting that Tate & Lyle is "a national icon and is pro-brexit" and that "[n]ot doing something is likely to lead to Ministerial backlash, due to the lobbying reach of this company." More substantively, it might also point out that whereas Tate & Lyle has arguably benefitted from Brexit (in the sense that the tariff quota was unlikely to have been available if the UK had remained in the EU), British Sugar's suppliers – UK farmers – may find life outside the EU more difficult; if they exit the market in significant numbers, prices for UK-produced sugar beet may rise, which will obviously hurt British Sugar.
Tate & Lyle might, however, respond that it has not been immune from adverse effects of Brexit; for example, in its evidence relating to the Northern Ireland Protocol, it indicated that it expected its sales in the territory to fall. This was because of "non-tariff barriers to entry in the form of additional regulatory requirements and the risk of reclaims of EU customs duty (or for businesses other than retailers or wholesalers, the need to pay that duty upfront and recover it)." Those barriers are a direct result of the post-Brexit trade arrangements as between the UK mainland and Northern Ireland.
All this highlights the highly uneven impact of Brexit on business. For every alleged winner (such as, in the view of some, Tate & Lyle), there will often be perceived losers elsewhere - and even for the alleged winners, the picture is often one of gains in some areas but losses in others.
For more coverage of the ongoing impact of Brexit, see our Beyond Brexit Knowledge Portal.