Post-Brexit, the UK will offer preferential market access to developing countries under a Generalized System of Preferences (GSP). To allow developing countries to export to the UK after it leaves the EU on the same terms as the present, the UK Government’s plan is to replicate the GSP of the EU. This paper shows that simply rolling over the EU’s GSP, in particular, the rules for preferences removal (graduation), will determine changes in market access due to the uneven distribution of developing countries’ trade between the UK and the EU27 bloc. The country most affected would be India, which would lose trade preferences in the UK on a volume of trade worth approximately € 1.27 billion per year. Adjustments to the GSPs of both the UK and the EU, necessary to avoid the loss of trade preferences, are also discussed. Read Briefing Paper 32 – A POST-BREXIT GENERALIZED SYSTEM OF PREFERENCES FOR THE UK: HOW TO GUARANTEE UNCHANGED MARKET ACCESS FOR DEVELOPING COUNTRIES?