Yes, probably - reactive rather than proactive. Probably late August (hazy memory).
What gets me about the Waspbane is the cost of the refill - £17.30. Refill = lower plastic chamber and a box of their patent wasp-attractant powder.
https://www.thorne.co.uk/index.php?route=product/product&filter_name=wasps&product_id=2027
You might expect that when the chamber is full of wasps it would be easy to unscrew the chamber from the vertical 'chimney' and pour away the wasps and liquid and refill the chamber with a wasp attractant eg. beer, jam etc. But no: the entrance to the chamber is guarded by a one-way rubber valve so that you can't pour out the contents i.e. you have to throw it away and buy another @ £17.30
The answer is to remove the rubber valve, pour away the contents, and refill the chamber. However removing the valve is very difficult - I suspect it's glued in. I have managed it but it's a struggle
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