Apart from dandelion, I struggle to 'describe' smell.
If you've ever had a jar , or tasted proper heather honey, then the aroma at the hives is similar. Heather has a distinct 'robust' taste and smell. Intense honey tones but with not much indication of sweetness, rather fruity/earthy tones.Heather, especially when being extracted can also sometimes have a slight vinegary background aroma. whenever bees are on the heather you can smell it in the hives from yards away, Some would even say (like my mother) the smell can sometimes be sickly. Fresh heather nectar/honey in the comb has a deep orangey appearance (sort of Lucozade colour) and has a distinct sheen to it you can easily see on the comb the band of heather compared to other floral honey.