Hi! I would go for it. They'll expect of you for a 7 but it will be worth it. My trust is getting rid of home working for the majority but that might not be true for your trust. Could you ask for a compromise like one day at home? With the extra pay you could get some rock solid childcare like a nanny? Koru kids or similar have good candidates. Things will work out and if they don't then there is ALWAYS jobs in the NHS you can go back to. I've never seen so many band 5s go out to advert, when I started they were like gold dust.
Good luck and remember, every interview is good experience. Even if you don't get it, you can find out what you need to gain experience in to get the dream job.

Don't drop out! At least go for the interview and find out what flexibility there is and long-term the benefits of being in a role with more progression will more than outweigh any short term stresses. FWIW the vast majority of corporate B7 roles in the NHS have plenty of flexibility, I would have thought 2 days per week at home and some general flex around hours would be feasible - you might have to be prepared at least initially to be more flexible yourself e.g. to come on site more frequently but once you are settled in the role, if you have a good manager there's often a lot of trust to deliver the job in whatever hours and wherever you need to.

Also as per PP I would certainly mentally allocate at least some of the extra salary to additional childcare of some kind even if just to give you a bit more headspace for work in the short term, or to book her into after-school club when she starts regularly or similar?

If they offer you the role. You can negotiate some of this flexibility, such as two days WFH. Make sure you get in writing what they've agreed to before you formally accept the role.

Many managers are happy to give a bit of flexibility for the right person and the lower end of the salary range. You just have to ask and say what you definitely need and can not accept a role without.

I would consider both options. Should they offer you two days at home then that will be something. Although you're still going to need flexibility if you pick your child up from school in September, you will need childcare even if working from home.
If the role needs to be based in the office then you'll need to think about the commute and childcare.
Full disclosure, I was offered a band 5 in a different hospital. At present I work two afternoons from home to do school pick up. This role needed to be in the hospital Monday to Friday 9-5 and was further away. I just couldn't make it work. I couldn't find a breakfast club which started early enough. I'm sure you'll be fine, just be honest with yourself if you find it doesn't work for you or now isn't the right time. If you start now then you will be in an excellent position in autumn when you might need more flexibility.

I'm in a B7 NHS role and very rarely go on site and there is lots of flexibility. They will be flexible for the right candidate.

I would go for the interview, you may decide it’s not for you but it’s good experience and hopefully will give you that extra bit of confidence. No one knows what that specific Trust may want in terms of wfh so hopefully it will work out in your favour. Some Trusts are very pro wfh, some are not.