Short term you could take parental leave to give you time to organise this. If this is a recent breakup and you need some time from the pressure of work, Gp could well sign you off to give you time.
if you have the space, an au pair is probably most cost effective. Babysitters via childcare.co.uk maybe a possibility.
Outside of these options your only real option is to apply for flexible working with more family friendly shifts- you’re entitled to apply once per year. Make sure work know you’re now the primary caregiver.
Longtermi would think if employed with night shifts specified in contract that you’re unlikely to get much movement on this and probably are realistically looking at changing jobs to one with more friendly hours.
