Hi Emmy, I had a homebirth for my first and got the same 'putting the baby in danger' comments... just ignore them and get on with doing what YOU want to do.
I gave birth abroad, so I'm not sure what British midwives provide, but my practical advise would be:
Get some plastic sheets. I gave birth on the floor and we had a plastic sheet on the floor then a 'nest' of old towels, bedding and cushions.
The 2nd plastic sheet we put on the bed: we made the bed, then put a plastic sheet down, then made it again. Once DD was born, we got into bed to keep warm, then once she was cleaned and changed and I got dressed, we took the dirty bedclothes and the plastic sheet off and could get straight back into a clean fresh bed again.
Maybe your midwife will supply these, but we had to buy industrial strength bin bags for all the medical waste (and the placenta!) We also had to buy the super big pads that I had to wear after the birth [yuk! emoticon].
One other thing I've been thinking about that my midwife didn't prepare me for in the preparation course is that you will have to push the placenta out! All the books I'd read kind of skipped over that bit, saying, 'you'll hardly notice it, you'll be so wrapped up in your baby' and I got the impression that in hospitals they quite often give medication to help with the afterbirth, so no one had told me that I would have to push again, therefore I was dismayed and horrified to suddenly realise that I was expected to have to do some MORE pushing!!! Don't worry, it's not half as full-on as giving birth to the baby, but don't be suprised by it, like I was!
Good luck to you, enjoy it and make sure you get lots of tasty food in - I could have eaten a horse the day after.