Never had problems with the Culhane books my self! For your info, the ATR never expires. If you are not current, (IFR) then you will have to re-write the instrument exams if your license has lapsed more than three years after the expiry date of your IFR. Remember that a "ride" is required every two years for the IFR to remain valid.
Expats flying overseas with another license (ex. FAA) that get "prof" checks are not required to return to Canada every two years to renew. Keep copies of the rides and send other copies to TC. they will keep your file active. When and if you decide to return to Canada, only a Flight Test will be required to reinstate your IFR.
Keep the blue side up!