Just questioning the "getting it done a month early incase it needs anything" comment:
If it fails on something badly then doesn't that just invalidate your MoT (and hence your insurance) a month early?
I'm not sure on the law here so any clarification would be welcome, but I thought that if a car failed it's MoT then it could be seen by the law as being officially un-roadworthy. So unless you're taking it to be fixed then it shouldn't be used.
If it's about spreading the cost of repairs over the month then I can understand the logic, but otherwise I can't see how the argument stacks up.
BTW good luck with the test and hope it doesn't cost too much.