BeeJayBee
Queen Bee
Just found the Defra leaflet titled " Feeding Bees Sugar, best practice".
(don't know how to link this, sorry)
Think I'll change the feed just in case, although it's been so cold lately I doubt they have touched it anyway.........
Don't worry too much because you'd probably have noticed if something was wrong. They're flying, so have been collecting food, and you've seen no signs of dysentery.
For next time ... It doesn't matter if it's cane or beet sugar, but it's best to use only white granulated sugar - not raw, and not unrefined 'off-white', granulated sugar because both contain impurities (plant solids) that can disagree with the bees' digestive system, more especially if that's their sole source of food.
You could probably use caster sugar if that's all you've got, but commercially produced icing sugar almost always contains an 'anti-caking agent' that will have a similar effect on the bees.
The same with fondant. It should be Bakers' Fondant, which contains only sugar, glucose and water. Beekeepers shouldn't use Fondant Icing because it contains other stuff that is no good to the bees and they may even refuse to eat it.
You could play very safe and buy commercially produced feeds, but they're much more expensive.
Do you mean this leaflet? https://secure.fera.defra.gov.uk/beebase/downloadDocument.cfm?id=741 (right click -> copy link location -> paste into post)