No gas and air, but there are midwives and birthing pools.
The way maternity care works (as far as my experience goes anyway) is you start off on antenatal visits with a doctor or midwife (or a whole practice of doctors or midwives or a combo practice) and when you go into labour someone from that practice will attend your birth in the vast majority of cases, with occasionally a hospital OB/GYN resident instead.
I saw all three of the doctors in my OB/GYN practice over the nine months, and they were all familiar with my history and notes when delivery time came. Then they did their daily crack of dawn hospital rounds afterwards and I also saw them for my 6 week checkup (in one case sooner than 6 weeks as I had a problem that needed minor surgery to clear up). With the midwife practice I went to for DC5 it was the same three midwives with admitting privileges at the hospital, and I saw one or other of them at each prenatal checkup, and then ended up attended by two of them for DD4's delivery as she was induced (I had GD) and the entire episode took about two days, so more than one shift. Then they too did their crack of dawn hospital rounds. For ultrasounds, I went to a separate office that was within the hospital, but all my routine prenatal testing was done in the professional offices. I was referred for two glucose challenges, for DCs 4 and 5 they took place in hospital labs.
In the hospitals I went to, women got a dedicated OB nurse who stayed for her entire 8 hour shift or the entire labour if it ran over the duration of a shift with DD1 my nurse stayed for 12 hours so I wasn't dealing with a parade of different nurses coming and going during labour. Same nurse was assigned to me for part of my post natal care too, along with others in shifts. RNs did not change sheets or do any other 'housekeeping' type work -- that was for nurses' aides or LNs. Midwives and OB/GYNs did not do any routine nursing work (checking vital signs, checking stitches, assisting with mobility and managing medication as well as performing blood tests on newborns - that was for nurses). MWs were on a par with the OB/GYNs. The hospital pediatrician also did rounds and checked on newborns.
My midwives had an office in a professional office building alongside other medical professionals' offices -- iirc they were next door to an ear nose and throat practice on one side and an OB/GYN practice on the other. There was a registered dietician on the same corridor, and I was referred to her for GD care. My antenatal and postnatal visits all took place in this building, separate from the hospital.
In the hospital itself there were OB/GYN nurses, nursing aides, OB/GYN residents working under the supervision of the qualified specialists, and student doctors doing their OB/GYN rotation, as well as LNs and student nurses. DD3 was delivered about 2 am by an OB/GYN resident and a very experienced OB nurse a really calm and straightforward delivery with the nurse pretty much calling the shots and the resident constantly in touch with my OB who was stitching up a CS patient as I was pushing. DD2 was delivered by a resident too, with my OB arriving just in time to see her shoot out (literally, almost) and then stitch me up I had an unseemly short labour and DD2 was almost born on the way to the hospital. For my other deliveries, I had my own doctor or MW present along with students at various stages of training -- my MWs had a student each for their shifts, and my doctors were accompanied by residents (with my permission. I could have asked for just the doctor or MW).
For me, the continuity of doctor/MW care meant a lot, and even on those times when a resident was in charge they were constantly in touch with my own doctors and had my notes available on the computer every time (though nobody had time to consult them for DD2). What stood out however, was the attention both hospitals paid to excellent nursing care, which imo makes all the difference in a hospital no matter what department, but especially in the post natal area. Good morale, professionalism, kindness -- all go such a long way.
Another thing I liked was that everything you could possibly need was laid on by the hospital -- hospital gowns (no need ever to bring and ruin your own nightie), bedsocks, maternity pads, perineal ice packs, perineal irrigation bottles, nappies, clean towels, ensuite bathroom, soap. Both hospitals were so clean you could eat your (nice) meals off the floor and the cleaning staff were all friendly and discreet. Meals were enormous and you could order from three choices for each meal, and order a snack in between meals too (sandwich, pot of yogurt, fruit). The tea was terrible but heyho..