Sorry haven't replied for a while.
Yes there is ventilation, not sure if its enough. there is 4 x 1 inch holes in the lid.
Since i removed the 8 frames of honey they havent 'bearded' like that since.
I didnt make the frames that were in there, but i think they had foundation. the honey wasnt dark when it came out, just a few bit of comb were darker, once i got it in the shed and checked it out it was all pretty normal looking, i think
Its just turned Autumn here and the weather has changed from hot/dry to wet/warm. Big trees are about to flower and bee activity seams just as intense as it had been all summer.
I will open it and have a look how they are going with the new frames. 5 or 6 still had drawn comb and 2 or 3 had new foundation.