@Panicmode1 We got a leaflet saying 'if your boiler is more than 10 years old you could save loads by installing a new efficient one' with a link to work out the time it would take to repay the investment with savings on bills.
As ours is 15 years old I plugged in all the details on the website and it told me their 'new fantastic ultra efficient boiler' would save around £30 a year compared with our 15 YO (admittedly decent quality and efficiency) Worcester Bosch combi boiler so it would take around 20 years for the investment to be paid back.
I went back to plan A of letting it keep going until it needs replacing.
I used an energy monitor to do the same calculation on our 25 YO fridge freezer with knackered seals and it would take about 5 years of electricity savings to repay the replacement cost of that so I do have a vague plan to replace it soon, especially as that was before the April 22 price rises so might be shorter now.
Plus I am curious as to how long it will live, left to it's own devices and obviously there's the environmental cost of disposal of an old appliance.
But to answer the OPs question, we're around 3500 electricity and 12500 gas for all electric cooking, dishwasher and shower. Only gas use is combi boiler central heating.
For 2 adults, one WFH, in a post war small 2 bed semi but with large downstairs kitchen extension that has cavity wall insulation but crap old leaky double glazing.
We're not as careful as we could be so are looking at various tweaks to generally use a bit less as I feel we should be slightly below the numbers the price cap is based on and of course it's because of likely short supply over winter that prices are going up so we need to do our bit.