ple are more likely to downgrade on food than household stuff, which is frankly just mad.
Try Sainsburys smartprice tea bags, dh never noticed the change from pg tips. Not anyone else sp teabags though.
If you use dishwasher tabs use tesco daisy powder instead, it will last ages and clean just as well as finish. Poundshop for rinseaid.
Sell things you aren't using on eBay. Free listing today.
Tk Maxx for treats, you can get some real bargains in there especially on homeware.
Cardfactory for greeting cards, wrapping paper etc.
Don't buy brand name painkillers, antihistamines, thrush treatments etc always buy the cheapest versions, they all have to be the same purity to be used in pharmaceutical products so you really are paying for the label.
Extra layers in the house will mean lower bills, I get thermals from Aldi/lidl as I feel the cold more than dh.
If you can change your mobiles there are some tariffs now with loads of minutes and data for £7.50 plus you can get cashback on them. Eg I pay £7.50, we have family who pay £45 for an iPhone but who are being repossessed. 
Line curtains with fleece blankets from Asda/Ikea, it makes a noticeable difference to the room. I made draught excluders for our lounge and this helped too.
It's not actually bad being frugal as having money in the bank is quite relaxing.