1. What is the primary legislation governing registration of title in your system?
The Mortgage Act 1851.
2. Are there specific rules and forms for registration directly provided for in statute under secondary legislation?
There are a number of Acts and Royal Decrees.
3. How often do changes arise in property/conveyancing legislation and registration legislation respectively?
Changes do occur but are rather rare (our principal Act dates back to 1851 and the man/woman of 1851 would still feel at home in the present Land Registry).