health hazards at Spinelli's Coffee House, Kemp Town, Brighton

I was in the basement of the Spinelli Coffee House in Kemp Town, Brighton, UK, enjoying good coffee and an almond croissant when an employee came over, kneeled beside me, and started spraying a large plant right behind me. I was incredulous and didn't say anything. I really wish I had, but I was so shocked I was lost for words. He wasn't using water as there was a chemical smell. He sprayed for a long time and then left without acknowledging my presence at all. I felt unwell and moved to a different seat. I'm still feeling unwell. Can you believe it?

If this is the way they treat customers I wonder if their coffee's safe. The worst thing is that in every other way it's a nice cafe, but who on earth would go back after being treated like this?