Hi Anvilman,
Its all bad news im afraid, yes you can use your hours towards your jaa atpl , but as it says in previous replies , it is going to take you a good 9-12 months to do the jaa approved ground school.
Ive just got hold of some ground school folders from a well known groundschool provider in the uk and its for more involved.
you will also need 155 hours for a jaa cpl h .
so good luck !