You are good to go :) Get your reference letter in particular format from Pak employer and apply :) Particular format = Detailed job duties matching with your NOC, working hours and salary on letterhead with stamp if possible. Thanks
If you are living in Pakistan your visa office can not be Lahore or ISB. It must be london. Be careful while you are choosing your visa office. I just saw Lahore in your profile. Thanks
you do not need to provide reference letters for your second job as you are not claiming points for that job. But if you wanna include that as well , no harm :)