I have given notice to leave the company and have asked to take my few days remaining annual leave during this period, my email requests have been ignored, manager never available for telephone conversation.
How can I determine if I can take my remaining annual leave during this time?
I would send an email to your manager, his boss and HR stating your intentions. It's important that his boss and HR get it as well because he's obviously dropping the ball and you need to make sure that there is as much record as possible in case they try to dock you the hours you're taking as leave by saying "you didn't request leave".
Make sure that you put all relevant details, including the fact that you've made multiple attempts to go through your manager but haven't been successful and that you're only doing it this way because time is growing short.