Common Wasp (Vespula vulgaris)

I've been trying to get a shot of this behaviour the last couple of days - bear with me...

 

I'd noticed that wasps love thistles but looking closer what they actually look like they're doing is slowly but surely chewing through the stems just under flowers that are going over, dead-heading them if you like (you can just about make out where the stem is mostly cut through in this) and they then really seem to love the sap/fibres in the cut stem.

Done