Like others I think the Amazon expenditure needs looking into, but nearly £900 a month for food, toiletries, household items (bleach, washing powder, scourers) etc actually seems really reasonable. Have you seen how much fabric conditioner, washing tabs costs these days? A loaf of bread is just under £2 and butter around £4.
tbh I think, you need to sit down and look at the grocery spending (past orders are stored) and really look at how much things cost and whether there are own brand swaps you can do; same with the Amazon account - precisely what is it going on and are all the purchases necessary. CoL has hugely impacted this stuff, as has the increase in fuel - I was paying £1.25 per L a year ago, now it’s anywhere in the region of £1.57-1.63. That £12 more each time I fill my tank.
Even tho you have shopped around on other bills are there tariff changes you can make - if you have Sky, for instance, can you reduce to a basic package, have you taken out ‘kids’ TV now your older one is no longer watching CBeebies etc? Can you reduce the number of hours the water comes on for etc.
And if you cannot find any savings - then a hard conversation will need to be had about asking your wife to explore returning to work. I am in the process of this as we will have 2 in uni from September and I have been a SAHM for 21 years. Unplanned due to SEN/MH issues with one of the DC. However, I’d like to be able to do the topping up for the kids, rather than it always fall DH, and I’d like to build up a nest egg to supplement our retirement given I have no pension of my own until the state one kicks in. I am fearful that he feels the psychological and financial burden of providing for us at his age when a redundancy (or ‘early retirement’ after he reaches 60) would impact us heavily whilst the kids may still be in education. It’s meant to be a partnership, isn’t it, and whilst my being a SAHP has facilitated and supported his career, as family life changes and we age, I need to adapt too.
I think it will be good for my self-esteem and therefore our marriage to have a ‘life’ outside the home again. And, perhaps, it is this latter tack that you take in encouraging your wife to explore this?