hey Zambezi, unless you fall into the category that JJ described, you will have to do the 14 exams. Correct you are exempt from ATPL groundschool, but you would be well advised to attend a short crammer course, as the syllabus and questions are very different from what you're used to (I guess SA ATP?). At the very least, buy 3-month access to the online question database from Bristol groundschool, their questions are very good and even guys from other groundschools in the UK sign up with them.
I have heard that MK will consider you before you have all the subjects, as they can get you started with a Ghanaian validation. You fly on that for 6-12 months during which you have to get your subjects and, once 500+ hours on type, a UK sim check.
Good luck and pm me if you have any more questions..