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Good afternoon, as you are an indefinite leave to remain holder from your question are you planning to apply British citizenship if yes then the rule is you have not travelled outside the U.K. more than 450 days in the last 5 years.
On ILR you should not stay out of the U.K. more than 2 years therefore if this time period has been reached. I would not advise going again for another year.
For ILR should have the intention to permanently reside in the U.K. therefore if you are out of the country for a long period you may have to apply for returning resident visa and show why you were outside for so long.
When your in Hong Kong planning to come back to the U.K.
If your ILR has expired then you should look at the returning resident visa. Glad to be of assistance today. Kind regards