I can get a bottle of 50% isopropyl alcohol here in the UK from a
dicount store for about 0.70 UK Pounds (approx 1 US dollar). I use it
for general household cleaning.

The bottle is 473 ml (1 US pint). The 50% is by volume.

Alcohol is so heavily taxed in the UK and this is particularly cheap. I
suspect that the price of 0.70 UKP many not cover the cost of the UK tax
due on it.

Does anyone know how much UK tax should be paid on 230 ml of isopropyl
alcohol?