Been offered a job - but now I can't take it - WWYD?
DP made redundant 2 weeks ago. We have both been on a massive job hunt - I have been offered a job, and had the induction (form filling etc) on Friday. I am due to start training tomorrow.
The job is 25 hours per week, £6+ per hour. We have 2 DS, age 3.2 and 19 mo. DS1 has just started nursery in the mornings.
DP has now been offered a full time job (offered this 5pm Friday afternoon) which involves daily commute to another town. In the next 6 months we will look to sell our home and move to New Town 
I am trying to work out what is best re this job - the original idea was that DP would look after the boys whilst I go to work. I'd be on early shift (changeable starting hours, between 7am-9am) and home at lunchtime.
Now that DP has a job, he'll be on the train at 7am, which is the time I'd be starting work.
I can't realistically get childcare at such an early hour, and even if I could I suspect the cost would be more than my wage. If DS1 is at nursery, this would reduce childcare fee though.
I think we are not eligible for tax credits (although I'll check this - DP will now be spending £300+ per month on railcard, and I'm not sure if this will be taken into account by tax credits lot or not).
The alternative is that I get an afternoon shift (this may be possible), and take DS1 to nursery in the morning. However, this would mean extra childcare costs 
.
DS1's nursery is only open in the morning. If I need an afternoon place, I'll have to go on a waiting list for the other 2 in the area.
Friend suggested that just turn up and do the training, get paid for a couple of weeks, then hand in notice before DP starts work. I am not keen to do this, it's rather disingenuous and I'm not keen on messing them about. I did rather like the HR person who hired me, and don't want to mess people about (any more than necessary ).
I really want to have some type of work, but I have to balance the books, and if childcare is more than my wage then it's a no go I think 
WWYD!