After I posted about the OSR this lunchtime I had a look at my bees - loads of pollen coming in, but very little in the way of stores, although plenty of empty comb including a lot of brace comb (curses). So now I've fed them 4 kilos of 1:1 syrup which they're going mad for while the fliers are bringing in loads of yellow pollen. OSR apparently not providing nectar yet?