Naturalisation Application Enquiry

Hello,

I am currently on ILR and a spouse of British Citizen and due to apply for my naturalisation soon, Can anyone please help me with few questions :

1. Can i travel outside UK while my naturalisation application is in processing at home office in the UK?

2. Is there a time limit to how long i can travel for outside UK while my application for naturalisation is being processed at home office in the UK?

3. What evidence i have to submit as a spouse of a British Citizen for " Proof of living in the UK for 3 years as a spouse of British Citizen "

4. Is there a priority service for Naturalisation applications currently at home office in the UK?

I look forward for anyone's help with above questions.

Many Thanks

1. Yes.

2. No limit.

3. Passport, all stamped pages.

4. No.