For me Bookers is about 10 miles from work, but takes almost an hour to get there and back.
Also, the offer is limited to two. I have tried bending their rules, and they don't like it.
Once you take into account the hassle factor, the ridiculous queues with often 1 person serving, the fuel and the time, it puts me off going to Bookers.
Most of the time, I just end up filling a trolley with 5Kg bags when doing the weekly shop (much to the wife's embarrassment!
). 5Kg bags is a very convenient size, and have paid more than 77p a Kg in the past.
Finding an optimal method of buying sugar is still on my list of things to do.