i am having my 2nd hb,5th baby
i would say get as much as possible to cover the floor,get what you think you will need,and then get more,during the actual birth it wont be too messy but afterwards,the journey from wherever you give birth to the loo and back again will be messy,we underestimated how much we needed last time.
I am having a birthing pool,last time i hired from the hospital this time ive bought a la bassine one with a liner so i can either sell it on or use it again.
Oils to burn,music,massage oil,things to make you comfy,i have a birthing ball as i find those really helpful in the early bit.
tea/coffee/juice and biscuits for the midwife.
im not sur eif it differs area to area but here you must have one of those angled lamps for the midwife to use to check you after the birth,and a plastic bowl for th placenta and/or any rubbish,and some bin bags to put all the stuff you throw away afterwards.