Studying for the ATPLs will be difficult if you’re working full-time IMO, I studied for the ATPLs full-time and taking one day off per week, I had just about enough time to do a part-time shift on a Sunday (which was at a quiet shop so I could continue with my ATPL homework there). However, if you’re willing to study evenings and weekends and take no days off then you may be able to progress at a fairly good pace.
Whilst I personally studied elsewhere at a full-time ATPL groundschool, I had several friends that went through Bristol Groundschool distance-learning whom recommended it whole-heartedly due to the support, study material, feedback and refresher sessions offered prior to exams.
Good luck
