Sadly £3 bras from Primark and 32Fs just don't go together in the same sentence. Cheap high street retailers don't seem to understand actual bra sizes at all and are of the impression that everyone with a small back has small breasts and only larger ladies have big breasts.
If anyone can advise the OP about somewhere that sells 32Fs for less than £20 when on sale, I'm sure she would love to hear from them. As would I! Due to pregnancy I have ballooned (pun intended) from 30C to 32F and due to a variety of factors, am trying to keep costs down as much as possible so have scoured the high street and Internet for cheap bras with no luck.
Without wanting to fixate on one aspect of the OPs dilemma, I'm going to continue ranting about bras. You simply cannot get by without at least 2 decent bras if you are above a B cup and over 21 (thank you so much gravity) one to wash and one to wear is the absolute minimum and that is of course assuming you can also find cheap styles that are suitable with the clothes you have, or cheap clothes to go with your cheap bras.
With the best will in the world, those £20+ bras are not going to last forever so will need replacing. Given that the OPs daughter is 14, it is hardly unrealistic to assume that she will start to find difficulty soon in finding good bras from the high street, genetics being what they are. So that is now 4x£20 bras initial outlay, with the bras being washed every other day. That means that 18 months use per bra should be considered good going, even if they are hand washed (and really, who has the time to hand wash 2 bras every.single.night of their lives?)
Doing the maths, that means that out of 3 years worth of clothing allowance, the OP has to spend £160, or around 20% of her budget, on one type of clothing. Add in the 50% that uniform takes up (while fervently praying that DD doesn't have a growth spurt, or that her school shirts are roomy enough to accommodate an increase in bra size without needing to replace them as well) and that leaves 30% of the budget for everything else her and her daughter need.
Can any of the teeth kickers who have posted honestly say they can adequately clothe themselves and a growing teen on less than £100 a year? What is she meant to do? Buy her DD a decent pair of boots and wear them to death, but blow half a years budget on them to ensure they last? Or buy a couple of pairs of cheaper shoes that need replacing every year? oh, except DD is a child, so her feet will grow, and need decent support while they are still growing to prevent a lifetime of malformation.
Well that's sorted then OP, your daughter can live in school uniform her entire life and you can go out in nowt but underwear and shoes once the clothes you have struggled to keep hold of and wearable for the last 5 years fall to pieces when you wear them. Yep, that is totally reasonable and anything less than that is just your own fault for expecting an extravagant lifestyle 