you mention magazines OP, aren't they about £4 these days? I bet whatever's in there is online.
gifts, I always buy well in advance. I know whose birthday I have to buy for (don't really do Xmas much) so if i see something that will work for them I will nab it months in advance if it's a good price.
have you seen what might be available cheaper from Amazon - the liquid iron I take is much cheaper there than in a shop for example.
I am just one person and very frugal so I can shop for myself on £15 a week all in no problem but I admit I am so frugal I'm not a great example as most people aren't prepared to do that.
btw re bread, if you can't fit it in the freezer then is there a cool spot in your home where you can keep it - my mum does that.
also did you know you can freeze cheddar - this is good because for me it means I can buy a better value pack, chop into 4, then freeze. I also do work packed lunches.
I'm in London and I really can't stomach paying £3 for a sarnie or whatever.
(outside of that cost I have protein powder and sometimes bars, but not every day, usually every other day after a weights workout and I only ever buy those on special).