Have you brewed it yet?...I have mixed opinions about John Bull Kits, is it in the large can with the purple lable, if so I have tried that and it was great, however I also made up a porter from the same range an it was aweful. To make matters worse I also made up their Executive Bitter and it got an infection and I had to open 40 bottles and pour them down the sink.(Not John Bulls fault to be fair)
I used to enjoy a beer made from a 1.8 kg JB Kit best bitter kit made up with 500g drymalt extract and 500g brewers sugar. It took about a month to reach its best and although it wouldn't win any awards it made a refreshing bottled beer that was good to drink chilled on a hot day, infact having just remembered that, i'm going to buy that kit tomorrow so i've got something to fill up the empty bottles after the holiday season.