For maternity pads last time I bought the boots own brand ones that were £1 and found them great. The hospital gave me some pants but they felt so restricted on my legs I went straight to my own big pants and pads. I had a few packs but didn’t actually use much as my bleeding wasn’t too bad. Same with breast pads, I bought a couple and we also get pads provided in the baby box in Scotland so I ended up with loads I didn’t even use because I didn’t leak.
For sterilisers, I wouldn’t waste money getting any fancy. We used the Milton cold water box last time and it was perfect, easy and cheap! I seen so many reviews for other sterilisers that you need to wait on the bottles then cooling down afterwards. I use Milton stuff for everything now!