Since OP is referring to a traditional full english with a traditional pint, I assume it would be a bitter or real ale with ~3-4% ABV, so the hydration may also

Since OP is referring to a traditional full english with a traditional pint, I assume it would be a bitter or real ale with ~3-4% ABV, so the hydration may also outweigh the diuretic effect (although it’s obviously not the ideal remedy in that regard).