England voted 53.37% to leave and 46.63% to remain

How do is the figure derived?

Total vote 33,551,983

Comprised of

Leave:     17,410,742 (51.9%)

Remain:  16,141,241 (48.1%)

Scot Leave:              1,018,322

NI    Leave:                 349,442

Wales Leave:              854,572

Celts Leave  Total    2,222,336

Scot Remain:               1,661,191

NI  Remain                     440,707

Wales Remain:              772,347

Celts  Remain Total    2,874,145

Subtract the Celts totals for Leave and  Remain and subtract those from the overall Leave and Remain votes, viz:

England Leave:    17,410,742 – 2,222,336 = 15,188,406 = 87.23% of the leave vote

England Remain: 16,141,241 –  2,874,145 =13,267,096 =  82.19% of the remain vote

Total England vote 28,455,502

Finally calculate the percentage of the England vote for Leave and Remain

This is  gives  53.37% to Leave and 46.63% to  Remain