Jack Daniels is the only widely available Bourbon in the UK i can think of , supermarkets and off licences have a few options which randomly might make it into one pub or another but you can get a JD in every bar .
Trouble with Jack's is its too easy to drink , hence many years ago my elder sister convinced me to dilute it with coke which still feels like sacrilege but when your inclined to drink it at the same rate you drink beer something has to give .