I have a waspbane trap and refill it myself now using honey and Thatchers Gold Cider. It's a bit of a faff getting into it the first time and unless you are careful you will bugger it. The best way to get last years beasties out is to cut a hole in one of the top corners and tip them out then you can cover the hole with duct tape during the wasp season so that bees don't get in. Unscrew the clear top, pour in your favourite mix of sweet smelly stuff , screw the top back on and wait while the wasps die horribly, like they deserve ('cos one stung me on the neck this year and it itched for days).