We had been using a nursery while our children were pre-school, which was open 8 am - 6 pm, so yes, when they start school it does bring logistical problems (though on the plus side it gets cheaper as there is suddenly a fairly large portion of the day they are in school for free!)
We use a childminder, dropping the children there at 8am and then she walks them to school (she has her own child at the same school too). She has them after school too, though within the last year an after school club has opened, due to many parents needing wraparound care, so my kids go there twice a week, which I think is a nice balance, as they have some time at the club with more organised activities with their friends, and some chill out time with the cm. In the holidays we use a mix of cm and holiday clubs (you may find holiday clubs don't open until 9/9.30 and finish sometimes at 4, so not great as your sole form of childcare; however, we use the cm to drop off and pick up)
IME it's virtually impossible to find a job which fits around dropping off and picking up yourself, and usually if they do they're fairly low grade, eg some supermarkets do school hours shifts. Being a Learning Support Assistant is supposed to be pretty good for school hours,but unless your children are in the same school as you, you would probably still need some other care.
Our childcare bill is around £20 per day on school days for the before/after school care, so much cheaper than when they were in nursery. Holidays obviously more, but remember you can take some of your annual leave to cover parts of it.
Our children are at the age when they are still happy with holiday clubs and cm, but in a couple of years we're going to try to employ a Uni student for the summer hols, which from what friends tell me works well for that awkward age when the kids are young enough to still need supervision, but too old to want clubs or cm
HTH