4. What parts of his passport need to be notarised?
I have read that:
a. just the photo page is required
b. the photo page as well as all of the non-blank pages are required
c. all pages, including blanks are required.
My guess is "b", but i have read of success stories with "a"!
This one gets asked alot and there's confusion about it because the answer depends upon the type of application and the evidence needed to support the application.
An ILR or nationality application for example has an in-country residency requirement and so all pages usually are needed to support the application.
Spouse and fiance applications need to identify that the sponsor is entitled to sponsorship. For a British citizen with a current passport, the identity page is sufficient. If the sponsor is not British, other pages may be required to show that the sponsor is a permanent resident, like the page containing their ILR vignette for example.
Many fiance applicants like to copy the pages with entry stamps that support the fact that the two people have met and have an on-going relationship. The same can be said for a spousal application. If there is something relevant in other pages of the passport, they can be included.
There is also nothing to prevent the applicant from certifying blank pages either. Those who certify are quite happy to do this because they usually charge on a per-page basis.
Take note also, that the sponsor's passport is just a RECOMMENDED attachment, it is not mentioned at all in HC395 or any of its amendments. if a British citizen does not have a passport, there are alternative procedures that can be used. For a fiance/spousal application, the requirement is to obtain the sponsor's identity, not the travel history.