Hi Hendchrstn and welcome to GoY, I'd say it was a bit early to lift onions yet but it depends when you planted them I guess. We wait until the onion is, hopefully, the size of a tennis ball or slightly smaller and the onion stem has folded over at the top of the onion - for us this will be about another month, possibly longer. Simply pull up the onion and lay it on the soil to dry out for a few days (taking them under cover if it actually rains!). Then store in hessian or canvas, not plastic, sacks or plait if the stems are long enough and strong enough. Store somewhere cool and dry, keep a watch for any of them rotting and remove. Use the onions with the open necks first as they will not keep well and will rot soonest.

THANK YOU FOR YOUR HELPFUL ADVICE. THE GROWING SEASON IN LOCHINVER IS SO FAR BEHIND, THIS IS ONION SETS I PLANTED LAST YEAR

Then I would doubt you have any onions at all! They will have rotted over winter...