Hello,<br/><br/>I'd like to hear opinion on which phrase, <b>'in this particular case'</b> or <b>'on this particular issue'</b>, you find more natural in this sentence:<br/><br/><br/><br/> <i>In this particular case I will have to plead ignorance.</i><br/><br/><br/><br/>Thank you.<br/><br/><br/><br/>