Flyvirgin, you might be jumping the gun there and going to unnecessary expense.
ATPL distance learning can be done at your own pace; there's no need to "be up to speed" as it were before you enrol. See how it goes first, the maths involved is not that difficult and you might not need extra help. If you do, then it would be easier for a private maths tutor to see the relevance of what you're studying and what you're finding difficult by using the examples in your study manuals.
Cheers
Whirls