Near us one of the community centres has a community food centre - for £5 you get two shopping bags of basics, bread, milk, yoghurts, marg/butter and some veg and fruit as well
Olio is good but you have to be quick so set for alerts. Don't forget some of the things you can freeze or process. My lady had 50 punnets of strawberries las autumn so I asked her if I could take 20 and made Jam which I then shared with others I know are hand to mouthing at the moment.
Could you stretch to a couple of packets of seeds? Might be a fun project for the kids to save loo rolls for planting (just use normal earth as long as its not too clay like) and you could plant up tomatoes and lettuce to start with or beans or peas - I know it doesn't make many for bigger families but supr fresh , might enthuse the kids, good easter project.
Another thing to look out for is community fridges - again sometimes there is a small charge but its not usually anything enar supermarkets. I would also definitely go end of day shopping for yellow ticket items, chat up the staff and see if there are regular times they do it etc.
Any chance you can ring forward potty training??? That could really help. I might also approach health visitors regarding nappies see if they know of any hygeine banks that could help
I would definitely look at the possibility of alternatives for commuting or if ther is the possibility of a day working from home take it if you can. Make sure you are taking lunches and drinks to work as well as that is a big cash burner if you are not careful.
We are all feeling the squeeze on all fronts. Some people are better off but they have also been spending all their money so need to reign it in and wont find it easy.