Forget about the whisky/whiskey or any alcohol to be used to control your diabetes.
By all means enjoy it in moderation if you so wish - but alcohol cannot be used as a means to lower sugar levels. It's just daft.
Alcohol can cause glucose levels to drop when it's consumed but this isn't a remedy for high BGL's - merely a side effect due to your liver being preoccupied with the alcohol. I think alcohol can also makes people more insulin sensitive.
The UK currently advises 21 units weekly for men and 14 for women. However, they are changing their limits to 14 units for both men and women at the start of next year.
For your information (with the upcoming revised guidelines), that would work out at around 2 pub measures of spirits per day.
Grant