Question about whether or not I should cancel and re-do my application

So I'm a third year student, studying Chemistry full time, and for the past two years I've had a big maintenance loan and a maintenance grant because I lived with my single mother who didn't earn much, hence the grant. However this year her boyfriend moved in which changed the household income, so I thought I'd have to make him a dependant on the finance request. Turns out after some reading of the fine print the loan and grant are dependant on household income only for the year 2014/2015, so now I've added him for no reason.

This has reduced my loan to an amount where I'm really going to be struggling since the chemistry course takes up a lot of the week and leaves not a lot of time to a part time job, and gotten rid of the grant completely. On the student finance site it says only to cancel for a few reasons, with this not being one of them.

So what I'm wondering is if it's worth it to cancel my application and do a whole new one without my mums boyfriend included in household income and if I do, will it be in time for the new academic year (October for me)?

Thanks in advance!