<sod >The OBR thinks around ÃÂÃÂ£59bn of this deterioration is due to Brexit and the underlying deterioration of the economy due to the June 23 vote to leave the EU.< eod>< sod > The OBR thinks around ÃÂÃÂ£59bn of the ÃÂÃÂ£122bn deterioration in the public finances by 2020-21 is due to Brexit and the underlying deterioration of the economy due to the June 23 vote to leave the EU.< eod>