Hiya - Haven't read all the replies but I wanted to tell you my experience of homebirth in December. My DD was due 16 Dec 2009. On 18/12 there was serious snow all over the shop, the city was like an ice-rink, A & E was coping with 100 additional broken arms and ankles. I had very mild contractions 5-6 mins apart. I rang labour ward and they said homebirth was suspended. I cried and got my birth partner (stroppy older woman friend) round. She rang them and said "we intend to birth at home, if we stay home will you send someone out? " Labour ward sighed and said yes, they would, but it would be better if I crossed my legs and waited till the morning. I had a bath, got bored of the contractions and went to bed. Nothing was happening in the morning.
The next false start was on the 23rd Dec. I started having contractions about 3-4 mins apart early evening. I rang labour ward: "Ooh, we're not busy, shall we send someone out to check you?". A lovely midwife came round, and with hindsight, obviously I wasn't in labour because I opened the door and chatted to her. She did a VE - 0cm, contractions fizzled out there and then with the news, and so we all went to bed (Not the MW, who went back to the hospital).
Finally, 11pm on evening of the 29th Dec, I had proper contractions! 2-3 mins apart right from the start, and properly painful! Oooowwwww! I cried and asked DH to call the midwife. I refused to talk to Labour Ward on the phone as I was vomming repeatedly. The MW came round at 1am and checked me: 1 cm! Noooo! She went away again! Nooo! I wanted gas and air!
However, I was in proper labour and DD was born at home at 6.48am on December 30th, there was no problems with midwives attending, I had two for the birth (they arrived at 6am!) and a third came at 8am for dayshift to stitch me up.
The only thing is no students will be on shift over the Christmas hols, but I don't suppose you particularly want students coming anyway!
Generally if you put your foot down and do the stuck record "we will be having our baby at home, we expect you to send someone" then you will get someone coming out to you.