My mother had a good one (not). She'd always wanted a conservatory and was finally able to afford one. Problem was she found it too hot anytime of the year except for winter. But it did make a great 'drying room' for her laundry as she wasn't mobile enough to make it down the garden to washing line.
Hmm, spend +/- £15k to save...
Love all the ideas about household staff. Must implement those straight away...
Seriously, we use many of the suggestions already mentioned - I think that comes from being the child of a war baby whose parents lived through the Great Depression.
One I accidentally stumbled on - although you need a bit of freezer space for this - was getting to the reduced sections in the supermarket just before they take items off to chuck away. I was later than usual shopping last time and, as I perused the reduced section, a member of staff came up and started sweeping everything ood that day off the shelf. As I had a bit of space in the freezer, I nabbed as much as I could.
Must ask what time they do this next time I'm in the supermarket...
We've got water butts attached to all the down pipes from the roof - even on the greenhouse.
Having lung problems (and being a bit of a greeny before it was mainstream) I often use things from my pantry to clean. Like white vinegar for removing limescale.
I'm often in the charity shops - and not just for clothes. Last visit - 2 vases, bowl and set of measuring cups plus two (lidded) casserole dishes for a tenner... And Freegle (also called Freecycle) is great for getting other bits and bobs. Just make sure you've already arranged your "Muscle" and transport if getting anything of size.
Before I go shopping I go online to price compare. Luckily I have 2 supermarkets almost next door to each other so don't spend any savings going from one to the other. If something is cheaper in the 3rd local supermarket (which is a bit of a distance away from the other two) I wait until I'm going that way anyway - although I double check it is still cheaper before I go.
Another bit of advice - don't automatically buy the special offer/two-for-one. Compare prices and sizes. My local branch of a national supermarket often has 'specials' that are actually more expensive than buying, say, two individual items. Or the pack size in the 2-for-1 is actually smaller...
Don't assume that because it is in one of the discount shops that they are cheaper. Many times the pack is actually smaller or because it is an "everything is a pound" shop it is actually dearer than prices elsewhere.
I'm another that buys reduced usually half-dead plants from the nursery/garden centre. With a bit of TLC (and I give them a couple of drops of Rescue Remedy too) they usually come good. I can't seem to keep myself away from the reduced section in B&Q's garden section - got most of my strawberry plants plus 5 fruit bushes for half price. Would've got more only I was walking and couldn't fit more in my shopping trolley/bag thing - as it was I had a full shopper plus 2 carrier bags full to lug home!
I also keep my eye open for specials at Suttons, Marshalls etc - earlier in the year I got 6 strawberry plants for £1.99. Seeds in many places are half price (or better) at the moment. They might go out of date before next spring but that just means that the company (Fothergills/Suttons etc) don't guarantee germination but I find it usually only drops to 75% at the lowest.
Seed saving is also a good one for gardeners - just don't save seeds that are from F1/F2 plants (this is usually stated on the original seed packet/plant label) as they don't grow true to type.