Vinny's Allotment Plot

As it was the first of January 2025 I called at the plot today, not to do anything just to see how it was doing. I have onion sets planted all over the place but one small bed is doing particularily well for some reason? I dont know which variety they are or when they were planted on the grand scheme of things (All my onion sets were staggerd, planted over a couple of months?) One reason I CAN think of is that the soil in this bed was in good heart?  The frost got my Mooli last year so I used it as a green manure and just dug it in.Maybe the organic matter created has paid off? The bed was the only healthy looking bed of onions,so I took a piccie.