Hi Peter - we would need all 4 FR1s lodged at the same time. The Freehold would be processed first and then the 3 separate leaseholds
Title plans are only created once titles are registered. See PG 40 sup 2 for guidance on the type and quality of plans we require -
Preparing plans for HM Land Registry applications (PG40s2) - GOV.UK
If these are all voluntary applications and you have the deeds/documents then evidence of identity is not required -
Practice guide 67: evidence of identity - GOV.UK
I have only answered the Qs raised where your assumptions appear to be wrong ones or need clarity