The longest opening hours I’ve found was 7:30 to 6:30 which is not that much longer than the usual 8-6. My boy is at school now though so something might have changed. If you need longer hours, I would definitely look into childminders, they often offer better flexibility.
It sounds like you're not clear on the difference between childminders and nannies. A nanny would work for one family and look after only that family's children. A childminder usually works from their own home and may mind children from several families, so the cost is spread. Can be similar cost to nursery and offer more flexibility. There are pros and cons to each childcare option.
yes, you could ask your childminder to take dc to the nursery and pick them up afterwards. Normally they won't charge you for the time when dc are in the nursery unless your nursery is really far away I guess.
I am Stockbridge/Crewe Road South area,so a bit far away for your child minder probably. Realised I didn’t answer your previous question - currently 21 weeks pregnant and looking at childcare from July 2019 time