Babies can cost nearly nothing. I exclusively breastfed before 6 months, you don't actually need anything to breastfeed, you can just use normal bras and you don't need a breastfeeding pillow you can just work out how to breastfeed without pillows, people have done it for 1000s of years without pillows! If you don't plan to be away from your baby there is no need for a pump/bottles/steriliser.
We did start off with cloth nappies but we found out our local lidle does a pack of around 50 nappies for 2 pounds (when you spend over 30 pounds) we only change our child once or twice a day (as soon as he does a poo or if his nappy is bulging) modern disposables are amazing at containing wee, he never feels wet and has never had nappy rash, he only pood every 6-7 days pre 6 months, some breastfed babies poo only once a week, some poo multiple times a day) the lidle nappies actually work out cheaper than washing cloth nappies.
Clothes are cheap if you go to jumble sales and look at Facebook selling pages, avoid outfits as they are less comfy and you need a top/trousers/socks/vest, pre 6 months babies can just have a vest+babygrow.
I didn't find our heating costs went up, we did do more washing as ds was a puky baby.
You can give babies anything to play with and they'll be happy, plastic boxes, a spatular, an old plastic drinks bottle with rice in, don't worry you baby doesn't "need" a babygym, bumbo, jumperoo, playmat, bouncy chair we didn't have any of those things and ds hit all his milestones early.
The thing I would advise buying/asking for as a gift is a nice stretchy sling, I actually asked for it as a Christmas present for me and it was amazing, ds would just sleep in the sling, we didn't have a Moses basket and although my mum have us a fancy travel system ds was much happier in the sling, if you have the option I'd advise getting a pram that isn't suitable from birth and also a sling.
10 pounds is lots for scan pics, but they aren't a necessity so you don't have to buy them if you can't afford it.
After 6 months food costs a little bit, but milk stays a primary source of nutrition for a few months at least, if you choose to do baby led weaning it's just a case of cooking a few extra mouthfuls of food when you make your own dinner.
Ds is now nearly 2 and the big costs so far have been shoes and weather suitable clothing, these are unavoidable but you could ask for shoes, boots or a rain outfit for your baby's first birthday, toddlers are just happy to have a present to open they don't really care what's in it!