I just mentioned the dates and reason for my absences (e.g annual leave or weekend trip) in the application form. I never asked my employer for any letter and wasn't asked for proof by the home office.

My Experience with NCS and the timelines: I have been in UK on HSMP 2yrs + Tier1 1Yr + IrishCitizen 2 yrs. I applied for naturalisation via NCS. The person in the NCS gave me hard time as he thinks I am not eligible to apply for naturalisation. (I won't blame him as my case is a bit different). He ...