ATC- slightly more "technical", PPL texts in the blue second pack are also the CPL texts (7 of). One purchase for CPL end goal.
Bob Tait - highly recommended in industry. Simpler explanations of exactly same material. Conducts courses at Redcliffe (very good) and on line. Separate PPL (one text) and CPL (7) texts.
Be aware that buying the Student (Red) ATC Pack also has a logbook, student (lesson) guide and radio text. It wouldn't be much more to also get the Tait GFPT text and decide which way to go for the next level from there.
Also consider that if it's going to be two years until you start your CPL, air law may have some changes. Tait also regularly amends his texts in line with changes. (Not that ATC doesn't, but I get the impression not as regularly.)
If you get your medical now, you will know there are no underlying issues before you part with your training money and the Class 2 will last for 4 years. Don't wait until you're about to go solo before you realise they've lost your paperwork. (Same goes for SPL. Apply now and always send it registered post. They still lose it, but you have proof it's been sent and don't have go to the end of the 3 month queue again.)
