Must be a fixed-term investment/deposit account.
OP, if you withdraw the money, I can't see how that would affect your credit rating or affect your ability to get a mortgage. That said, mortgage providers do look for regular saving habits, but those habits don't have to include saving into a fixed-term account.
General thinking would be that it's not a great idea to have expensive loans while you have savings. I'd withdraw the money but set up a regular savings account for a smaller amount each month so you can prove ability to save.