What was interesting was to compare the bees coming and going from the two hives. On Friday the numbers were similar, but the old hands in hive 1 were all returning with their leg pouches crammed with yellow pollen, whilst the new kids on the block, in hive 2, were returning with only the odd one every now and again seeming to have found any pollen at all.
However, by Saturday, there was no obvious difference between the bees from the two hives - both sets returning with pollen pouches full on both legs !
Also I spotted one or two blacker, larger, bees without pollen and flying in a less urgent, more hovering type pattern. These ones had longer dangly legs. A bit of research later and I realise these are male drones. Hopefully this is normal ? Wikipedia would suggest so...