Stanleyuk

I was a retired civil servant of Hong Kong government and I got the monthly pension from Hong Kong government. I moved to UK two years ago and I am not working at UK. I don't have any income except the Hong Kong pension. However, I applied my UK tax account and made self assessment return in past two years, I would like to ask whether I can request to stop the self assessment for the coming year. What action I should take for making the request. Thank you.