i have no requirement to create a compartment for fire protection but i have a requirement to protect the structural walls of my building with 90 minute fire resistance and if i create a structural opening for a door, will the door leaf need a fire rating? Can 90 minute fire resistance be achieved in the door jamb allowing me to use a non fire rated door leaf?

I do not understand what you are proposing, is it in relation to B3 of the building regulations? Fire resistant door leaves and frame are integral and both have to resist the passage of fire for the required time, but not always are opening required to be fire resistant, it all depends of what you are trying to achieve. You need to provide more information.