I've been reading this with interest. We're not struggling to be honest, but only because we are very frugal and have been for years. Things are tighter now than they used to be but because we were always careful it isn't too bad. DH is at risk of redundancy though so it might be getting a whole lot tougher soon...
The two single things that have made a massive difference to us are a breadmaker (donkeys years old but still going strong) and a slow cooker (£12 from Asda). When I buy a loaf of bread in the shops I am amazed at the price. Something decent, but just a wholemeal sliced, nothing fancy is £1+. With our breadmaker its about 30p I think, especially if on the rapid setting so it doesn't take as long in terms of the electricity.
I get almost everything at Aldi, its really worth a trip if you've never tried it. About 5 years ago if I confessed to friends that I bought my groceries from Aldi they looked a bit embarrassed and assumed we must be dirt poor, now the same friends are shopping there and they love it!
Things I really rate in Aldi:
Nappies (size 3 and up) - Really excellent, about 45 nappies for £4.99, no leaks
Blueberries - When they are in the super 6 they are 69p for 125g, usually 99p I think
Grapes - can't remember the price but a lot cheaper than Asda
Fresh British chicken drumsticks - 750g, usually 6-8 drumsticks for £1.69
Fresh British chicken thighs - 750g, usually 6 for £1.99
Tinned chunky chopped tomatoes - 33p, nice and not as acidic as Asda own brand
Red kidney beans - 16p/tin
Belmont choc chip cookies - just like the Maryland branded ones, 40p/pack
Fish fingers - £1.49 for 15 (pollock not cod)
Almat Bio Washing Powder - £3.29 per 2.4kg (they say its 30 washes at 10.9p per wash but I use half that amount which makes it just over 5p per wash)
Magnum All In One Dishwasher Tablets - £3.99 per 40 pack, refuse to buy anywhere else now
Sadly they have just stopped doing Jive biscuit bars, basically fake twix's, they were SO good.
My top cleaning tips are:
A spray bottle filled with water and about 3 capfuls of white vinegar will clean almost anything (except chrome plated taps)
NEVER buy washing powder tablets, its always cheaper to buy the loose powder. Then you can put in as much or as little as you want and its cheaper to buy to start with.