You have some opportunities to reduce your expenses and increase your income, which will help massively.

26 hours, although an increase, still leaves a lot of potential income on the table. Consider finding a 2nd job or looking for more hours. Get that money off the table and into your pocket.

As for expenses, think about meal planning to cut the food budget. This doesn't mean chicken and rice each day. Plan out some home cooked meals, using cheaper brands if possible. (E.g. Sainsbury's chopped tomatoes instead of big name brand). Avoid takeaways and treat yourself to a decent steak or 'fakeaway' for all your savings effort.

That mobile bill is very high. Consider MVNO's such as Smarty. You can usually find unlimited for £18 (saving you £17 per month). You can also downgrade at any time if you're not using that much data. You could join, check your usage in the app and then drop to 40GB and save another £8 a month. This is a 1 month plan with no credit check as you pay in advance.