If you really wanted to know, then I'm sure Google could assist you. As a pp pointed out, the JRF stats show that 22% of the UK population are living in poverty, including many who are working. Those people by definition have minimal or no spare in their budget to cope with significant increases in essential expenditure. So for most of those people, the current increase in fuel, utilities and food will already put them in crisis.
Above them there is presumably a large swathe of the population who have managed okay until fairly recently, but will be increasingly heading towards trouble as the effect of the cost-of-living increases feed through. Exactly how and when people are affected will depend on their circumstances: people with a mortgage are going to be increasingly squeezed; people with four teenagers living at home will be affected by food cost increases more than a couple living on their own; people who live rurally and need a car to access work are being hit harder by the increase in petrol than city-dwellers who can use public transport.
In the medium-term, the effect of people cutting back on expenditure will affect small businesses, and businesses becoming unprofitable will inevitably result in people losing their jobs or having their hours cut, which then creates its own recessionary downward spiral.
At all levels, the 'Captain Samuel Vimes 'Boots' theory of socioeconomic unfairness' will apply: we've just paid an eyewatering amount to fill our oil tank, but we have also spent a chunk of money over the past couple of years upping our insulation, adding secondary glazing and solar panels, so that £900 of oil will now last us longer than someone who has not had the funds to carry out those works to their house.