I used to wear white tights for work (nursing). If I laddered on leg, I'd wait till I had another laddered pair, then cut off each laddered leg and wear two pairs, each for one leg. Saved a fortune when you wear them every day!
As to bulk buying, it saves an absolute fortune, not just "pennies". I bulk buy loads of stuff, especially loo rolls where you can save a pound or two very easily when buying a pack of 9 rather than two packs of 4 when there's an offer. Same with cans of fizzy drinks, crisps, baked beans, etc- often half price if you buy in bulk.
And yes, to shopping around - I go to B&M Bargains, Home Bargains and Wilko for toiletries, medicines, toothpastes, etc - you get the same brands far cheaper than supermarkets, so I stock up of whatever each has on offer.
I'd estimate I save £10-£20 per week easily by shopping around and bulk buying, and that's on the main brands, not buying cheaper own label stuff.
And a big yes to meal planning and having a list. We have virtually zero food waste - maybe an inch or two of milk, the odd slice of bread, the odd bit of veg or salad - certainly no more than a pound per week, probably 25p or so, and I kick myself at that for not planning better!