Bindy, just remember you can take it back if it's unopened. I found it was better to buy everything beforehand in case you can't get to the shop s for a while... I was able to borrow the electric one in hospital, but also found it really helpful to have my own Avent manual one there and let the midwives watch me use it as they could give me advice on positioning, etc.

And as I said, if you've got it but don't use it, make sure box is sealed and you can just return it anyway.