We have a similar income and mortgage, more kids but older so less childcare, SW London.
We are in a similar position each month, it's shit. Our cost of living has increased so much over the past couple of years for the basics so we feel less well off than we used to, food costs more, all insurances cost more, mortgage costs more.
Feeling it's shit doesn't mean I don't appreciate how fortunate we are.
We've cancelled sky, gym memberships, don't drink, eat out minimally. We could spend less on food shopping I guess but we are time poor so factoring a weekly shop at Lidl/ Aldi makes me want to cry.
Can you find a cheaper childcare option, where we live there are nurseries that offer childcare for toddlers over 2 years. These are generally a good bit cheaper and the standard of care is amazing as is the staff retention which I think is always an excellent indicator of how good a setting is. These are 1/2 the price of the nurseries that look after tiny babies too. Otherwise a childminder or nanny, again there are some excellent ones and having one before school starts means you'll be sorted for wraparound when that time comes. I think having a child at school opens your mind up a bit more to childminders are you see lots of them around, do you know people in your local area with children in the school you are likely to send your children to so that you can ask for recommendations.
Mainly posting in solidarity, it's not something that can be easily discussed as we are fortunate but sometime it's like WTF, we do nothing exciting and still have nothing left at the end of the month.